diff --git a/src/Inventory/Checker/OrderItemAvailabilityChecker.php b/src/Inventory/Checker/OrderItemAvailabilityChecker.php
index c48e6ec4..4a470a7d 100644
--- a/src/Inventory/Checker/OrderItemAvailabilityChecker.php
+++ b/src/Inventory/Checker/OrderItemAvailabilityChecker.php
@@ -14,7 +14,6 @@
 use BitBag\SyliusProductBundlePlugin\Entity\ProductInterface;
 use Sylius\Component\Core\Inventory\Checker\OrderItemAvailabilityCheckerInterface;
 use Sylius\Component\Core\Model\OrderItemInterface as BaseOrderItemInterface;
-use Sylius\Component\Core\Model\ProductVariantInterface;
 
 final class OrderItemAvailabilityChecker implements OrderItemAvailabilityCheckerInterface
 {
@@ -31,10 +30,8 @@ public function isReservedStockSufficient(BaseOrderItemInterface $orderItem): bo
             return $this->decorated->isReservedStockSufficient($orderItem);
         }
 
-        /** @var ProductVariantInterface $variant */
-        $variant = $orderItem->getVariant();
         /** @var ProductInterface $product */
-        $product = $variant->getProduct();
+        $product = $orderItem->getProduct();
         if (!$product->isBundle()) {
             return $this->decorated->isReservedStockSufficient($orderItem);
         }
diff --git a/src/Inventory/Checker/ProductBundleOrderItemAvailabilityChecker.php b/src/Inventory/Checker/ProductBundleOrderItemAvailabilityChecker.php
index ecf3086c..ccea2370 100644
--- a/src/Inventory/Checker/ProductBundleOrderItemAvailabilityChecker.php
+++ b/src/Inventory/Checker/ProductBundleOrderItemAvailabilityChecker.php
@@ -24,7 +24,7 @@ public function areOrderedBundledProductVariantsAvailable(BaseOrderItemInterface
         }
 
         foreach ($orderItem->getProductBundleOrderItems() as $bundleOrderItem) {
-            $quantity = $orderItem->getQuantity() * $bundleOrderItem->getQuantity();
+            $quantity = $orderItem->getQuantity() * (int) $bundleOrderItem->getQuantity();
             /** @var ProductVariantInterface $variant */
             $variant = $bundleOrderItem->getProductVariant();
             if (!$variant->isTracked()) {
diff --git a/src/Inventory/Operator/OrderInventoryOperator.php b/src/Inventory/Operator/OrderInventoryOperator.php
index c8bcbec4..6908bf34 100644
--- a/src/Inventory/Operator/OrderInventoryOperator.php
+++ b/src/Inventory/Operator/OrderInventoryOperator.php
@@ -69,34 +69,17 @@ public function hold(OrderInterface $order): void
         $this->productBundleOrderInventoryOperator->hold($order);
     }
 
-    //TODO
     public function sell(OrderInterface $order): void
     {
         $this->lockOrderProductVariants($order);
 
         if (!$this->featureFlagChecker->isEnabled()) {
             $this->decorated->sell($order);
-        }
-
-        /** @var BaseOrderItemInterface $orderItem */
-        foreach ($order->getItems() as $orderItem) {
-            $variant = $orderItem->getVariant();
-
-            if (!$variant->isTracked()) {
-                continue;
-            }
 
-            if (($variant->getOnHold() - $orderItem->getQuantity()) < 0) {
-                throw new NotEnoughUnitsOnHoldException($variant->getName());
-            }
-
-            if (($variant->getOnHand() - $orderItem->getQuantity()) < 0) {
-                throw new NotEnoughUnitsOnHandException($variant->getName());
-            }
-
-            $variant->setOnHold($variant->getOnHold() - $orderItem->getQuantity());
-            $variant->setOnHand($variant->getOnHand() - $orderItem->getQuantity());
+            return;
         }
+
+        $this->productBundleOrderInventoryOperator->sell($order);
     }
 
     /**
diff --git a/src/Inventory/Operator/ProductBundleOrderInventoryOperator.php b/src/Inventory/Operator/ProductBundleOrderInventoryOperator.php
index 296afc34..a88a50f9 100644
--- a/src/Inventory/Operator/ProductBundleOrderInventoryOperator.php
+++ b/src/Inventory/Operator/ProductBundleOrderInventoryOperator.php
@@ -13,6 +13,8 @@
 
 use BitBag\SyliusProductBundlePlugin\Entity\OrderItemInterface;
 use BitBag\SyliusProductBundlePlugin\Entity\ProductInterface;
+use Sylius\Component\Core\Inventory\Exception\NotEnoughUnitsOnHandException;
+use Sylius\Component\Core\Inventory\Exception\NotEnoughUnitsOnHoldException;
 use Sylius\Component\Core\Model\OrderInterface;
 use Sylius\Component\Core\Model\ProductVariantInterface;
 
@@ -34,7 +36,15 @@ public function hold(OrderInterface $order): void
 
     public function sell(OrderInterface $order): void
     {
-        // TODO: Implement sell() method.
+        foreach ($order->getItems() as $orderItem) {
+            /** @var ProductInterface $product */
+            $product = $orderItem->getProduct();
+            if ($product->isBundle()) {
+                $this->sellBundleOrderItem($orderItem);
+            } else {
+                $this->sellRegularOrderItem($orderItem);
+            }
+        }
     }
 
     private function holdBundleOrderItem(OrderItemInterface $orderItem): void
@@ -63,4 +73,40 @@ private function holdProductVariant(ProductVariantInterface $variant, int $quant
 
         $variant->setOnHold((int) $variant->getOnHold() + $quantity);
     }
+
+    private function sellBundleOrderItem(OrderItemInterface $orderItem): void
+    {
+        foreach ($orderItem->getProductBundleOrderItems() as $bundleOrderItem) {
+            $quantity = $orderItem->getQuantity() * $bundleOrderItem->getQuantity();
+            $variant = $bundleOrderItem->getProductVariant();
+
+            $this->sellProductVariant($variant, $quantity);
+        }
+    }
+
+    private function sellRegularOrderItem(OrderItemInterface $orderItem): void
+    {
+        $quantity = $orderItem->getQuantity();
+        $variant = $orderItem->getVariant();
+
+        $this->sellProductVariant($variant, $quantity);
+    }
+
+    private function sellProductVariant(ProductVariantInterface $variant, int $quantity): void
+    {
+        if (!$variant->isTracked()) {
+            return;
+        }
+
+        if (($variant->getOnHold() - $quantity) < 0) {
+            throw new NotEnoughUnitsOnHoldException($variant->getName());
+        }
+
+        if (($variant->getOnHand() - $quantity) < 0) {
+            throw new NotEnoughUnitsOnHandException($variant->getName());
+        }
+
+        $variant->setOnHold($variant->getOnHold() - $quantity);
+        $variant->setOnHand($variant->getOnHand() - $quantity);
+    }
 }