diff --git a/prototype/src/main/java/org/hso/ecommerce/controller/shop/ShopArticleController.java b/prototype/src/main/java/org/hso/ecommerce/controller/shop/ShopArticleController.java
index 9345e83..71a6a96 100644
--- a/prototype/src/main/java/org/hso/ecommerce/controller/shop/ShopArticleController.java
+++ b/prototype/src/main/java/org/hso/ecommerce/controller/shop/ShopArticleController.java
@@ -37,6 +37,7 @@ public class ShopArticleController {
 
     @GetMapping("/{id}")
     public String shopArticlesById(Model model,
+                                   @RequestAttribute(value = "shoppingCart") ShoppingCart shoppingCart,
                                    @PathVariable("id") Long id,
                                    HttpServletRequest request,
                                    HttpServletResponse response
@@ -52,15 +53,14 @@ public class ShopArticleController {
         }
         model.addAttribute("article", article);
 
-        if (warehouseBookingPositionSlotEntryRepository
+        int inStock = warehouseBookingPositionSlotEntryRepository
                 .getByArticle(id)
                 .stream()
                 .mapToInt(e -> e.newSumSlot)
-                .sum() > 0) {   //check if in Stock
-            model.addAttribute("inStock", true);
-        } else {
-            model.addAttribute("inStock", false);
-        }
+                .sum();
+
+        model.addAttribute("inStock", Math.min(inStock, 10));
+        model.addAttribute("inCart", shoppingCart.getArticleCount(article));
 
         List<Article> commercialArticles = GetRandomArticlesAction.getRandomArticles(3, articleRepository.getAdvertisedArticles()); //get 3 advertised Articles
         model.addAttribute("commercialArticles", commercialArticles);
@@ -78,7 +78,7 @@ public class ShopArticleController {
                                       @RequestParam(value = "set_amount", required = false) Boolean setAmount,
                                       @RequestParam("fastcheckout") Boolean fastcheckout
     ) {
-        Article article = articleRepository.findArticleById(id);
+        Article article = articleRepository.findById(id).orElse(null);
 
         if (article == null) {
             request.setAttribute("error", "Der Artikel wurde nicht gefunden.");
diff --git a/prototype/src/main/java/org/hso/ecommerce/controller/shop/ShopCheckoutController.java b/prototype/src/main/java/org/hso/ecommerce/controller/shop/ShopCheckoutController.java
index f90b1ac..112083a 100644
--- a/prototype/src/main/java/org/hso/ecommerce/controller/shop/ShopCheckoutController.java
+++ b/prototype/src/main/java/org/hso/ecommerce/controller/shop/ShopCheckoutController.java
@@ -57,13 +57,27 @@ public class ShopCheckoutController {
 
         CheckoutListTotals totals = new CheckoutListTotals();
         ArrayList<CheckoutListItem> items = new ArrayList<>();
+
+        boolean inValid = false;
+
         for (ShoppingCart.ShoppingCartItem item : shoppingCart.getItems()) {
             Article article = articleRepository.findById(item.getArticleId()).get();
 
+            int inStock = wbeseRepo
+                    .getByArticle(item.getArticleId())
+                    .stream()
+                    .mapToInt(e -> e.newSumSlot)
+                    .sum();
+
             totals.addItem(article, item.getAmount());
-            items.add(new CheckoutListItem(item.getAmount(), article));
+            items.add(new CheckoutListItem(item.getAmount(), Math.min(inStock, 10), article));
+            if (item.getAmount() > inStock) {
+                inValid = true;
+            }
         }
 
+        request.setAttribute("inValid", inValid);
+
         request.setAttribute("checkoutItems", items);
         request.setAttribute("checkoutTotals", totals);
 
@@ -87,11 +101,13 @@ public class ShopCheckoutController {
         public int amount;
         public Article article;
         public int total;
+        public int inStock;
 
-        public CheckoutListItem(int amount, Article article) {
+        public CheckoutListItem(int amount, int inStock, Article article) {
             this.amount = amount;
             this.article = article;
             this.total = amount * article.getPriceGross();
+            this.inStock = inStock;
         }
     }
 
diff --git a/prototype/src/main/java/org/hso/ecommerce/entities/shop/ShoppingCart.java b/prototype/src/main/java/org/hso/ecommerce/entities/shop/ShoppingCart.java
index d059f15..ff47fe2 100644
--- a/prototype/src/main/java/org/hso/ecommerce/entities/shop/ShoppingCart.java
+++ b/prototype/src/main/java/org/hso/ecommerce/entities/shop/ShoppingCart.java
@@ -69,6 +69,16 @@ public class ShoppingCart {
         items.removeIf(i -> i.getAmount() <= 0);
     }
 
+    public int getArticleCount(Article article) {
+        for (ShoppingCartItem i : items) {
+            if (i.getArticleId() == article.id) {
+                return i.amount;
+            }
+        }
+
+        return 0;
+    }
+
     public static class ShoppingCartItem {
         private int amount;
         private final long articleId;
diff --git a/prototype/src/main/resources/static/css/ecom.css b/prototype/src/main/resources/static/css/ecom.css
index 2a696d2..d48664c 100644
--- a/prototype/src/main/resources/static/css/ecom.css
+++ b/prototype/src/main/resources/static/css/ecom.css
@@ -380,7 +380,7 @@ button, .button {
    /* box-shadow: var(--s-0-secondary); */
 }
 
-button:active, .button:active {
+button:enabled:active, .button:active {
    background-color: var(--c-primary-highlight);
 }
 
@@ -392,6 +392,10 @@ button,
    transition: background-color 0.1s ease-out;
 }
 
+button:disabled {
+     filter: grayscale(100%);
+}
+
 label {
    display: block;
    min-width: 10em;
@@ -761,6 +765,7 @@ input[type="number"]:focus {
 
 .error {
    background-color: var(--c-error);
+   color: var(--c-base);
    text-align: center;
    font-size: var(--u0);
 }
diff --git a/prototype/src/main/resources/templates/shop/articles/id.html b/prototype/src/main/resources/templates/shop/articles/id.html
index 00d2c73..1686bef 100644
--- a/prototype/src/main/resources/templates/shop/articles/id.html
+++ b/prototype/src/main/resources/templates/shop/articles/id.html
@@ -38,17 +38,28 @@
                                 th:text="${#numbers.formatDecimal(article.getPriceGross() * 0.01, 1, 'POINT', 2, 'COMMA')}"></span><span> EUR</span>
                         </h2>
                         <div>
+                            <input type="hidden" name="set_amount" value="true"/>
                             <label class="nolinebreak">Menge:</label>
                             <select name="quantity" size="1">
-                                <option th:each="quantity : ${#numbers.sequence(1,10)}"
+                                <option th:if="${inCart > 0}" th:value="${inCart}" th:text="${inCart}"
+                                        selected></option>
+                                <option th:if="${inCart > 0}" value="0">Entfernen</option>
+                                <option th:if="${inStock > 0}" th:each="quantity : ${#numbers.sequence(1,inStock)}"
                                         th:value="${quantity}"
                                         th:text="${quantity}"></option>
                             </select>
                         </div>
-                        <h3 class="no-margin secondarytext" th:text="${inStock} ? 'AUF LAGER' : 'NICHT AUF LAGER'"></h3>
-                        <button class="no-margin secondary" name="fastcheckout" value="false">In den Einkaufswagen
+                        <h3 class="no-margin secondarytext"
+                            th:text="${inStock > 0} ? 'AUF LAGER' : 'NICHT AUF LAGER'"></h3>
+                        <button th:if="${inCart == 0}" class="no-margin secondary" name="fastcheckout" value="false"
+                                th:disabled="${inStock==0}">In den Einkaufswagen
+                        </button>
+                        <button th:if="${inCart > 0}" class="no-margin secondary" name="fastcheckout" value="false"
+                                th:disabled="${inStock==0}">Anzahl im Einkaufswagen ändern
+                        </button>
+                        <button class="no-margin" name="fastcheckout" value="true" th:disabled="${inStock==0}">Schneller
+                            Checkout
                         </button>
-                        <button class="no-margin" name="fastcheckout" value="true">Schneller Checkout</button>
                     </div>
                 </form>
             </div>
diff --git a/prototype/src/main/resources/templates/shop/checkout.html b/prototype/src/main/resources/templates/shop/checkout.html
index b5aea23..bab984d 100644
--- a/prototype/src/main/resources/templates/shop/checkout.html
+++ b/prototype/src/main/resources/templates/shop/checkout.html
@@ -58,12 +58,19 @@
                             <select name="quantity" size="1">
                                 <option th:value="${item.amount}" th:text="${item.amount}" selected></option>
                                 <option value="0">Entfernen</option>
-                                <option th:each="quantity : ${#numbers.sequence(1,10)}"
+                                <option th:if="${item.inStock > 0}"
+                                        th:each="quantity : ${#numbers.sequence(1,item.inStock)}"
                                         th:value="${quantity}"
                                         th:text="${quantity}"></option>
                             </select>
                             <button class="small">Ändern</button>
                         </form>
+
+                    </td>
+                </tr>
+                <tr th:if="${item.amount > item.inStock}">
+                    <td class="error" colspan="4">
+                        Die gewählte Anzahl des Artikels ist leider derzeit nicht lieferbar.
                     </td>
                 </tr>
                 <th:block>
@@ -138,7 +145,9 @@ Musterstraße 4
                 </table>
             </div>
             <div th:if="${user}">
-                <button class=" no-margin secondary full-width">jetzt kostenpflichtig bestellen</button>
+                <button class=" no-margin secondary full-width" th:disabled="${inValid}">jetzt kostenpflichtig
+                    bestellen
+                </button>
             </div>
             <div th:unless="${user}">
                 <a th:href="@{/login}" class="button secondary no-margin full-width">Einloggen und fortfahren.</a>