diff -u b/modules/promotion/src/Plugin/Commerce/PromotionOffer/BuyXGetY.php b/modules/promotion/src/Plugin/Commerce/PromotionOffer/BuyXGetY.php
--- b/modules/promotion/src/Plugin/Commerce/PromotionOffer/BuyXGetY.php
+++ b/modules/promotion/src/Plugin/Commerce/PromotionOffer/BuyXGetY.php
@@ -4,6 +4,7 @@
 
 use Drupal\commerce\ConditionGroup;
 use Drupal\commerce\ConditionManagerInterface;
+use Drupal\commerce\Context;
 use Drupal\commerce\Plugin\Commerce\Condition\PurchasableEntityConditionInterface;
 use Drupal\commerce\PurchasableEntityInterface;
 use Drupal\commerce_order\Adjustment;
@@ -11,6 +12,7 @@
 use Drupal\commerce_order\PriceSplitterInterface;
 use Drupal\commerce_price\Calculator;
 use Drupal\commerce_price\Price;
+use Drupal\commerce_price\Resolver\ChainPriceResolverInterface;
 use Drupal\commerce_price\RounderInterface;
 use Drupal\commerce_promotion\Entity\PromotionInterface;
 use Drupal\Component\Utility\Html;
@@ -48,6 +50,13 @@
   protected $conditionManager;
 
   /**
+   * The chain base price resolver.
+   *
+   * @var \Drupal\commerce_price\Resolver\ChainPriceResolverInterface
+   */
+  protected $chainPriceResolver;
+
+  /**
    * The entity type manager.
    *
    * @var \Drupal\Core\Entity\EntityTypeManagerInterface
@@ -69,13 +78,16 @@
    *   The splitter.
    * @param \Drupal\commerce\ConditionManagerInterface $condition_manager
    *   The condition manager.
+   * @param \Drupal\commerce_price\Resolver\ChainPriceResolverInterface $chain_price_resolver
+   *   The chain price resolver.
    * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
    *   The entity type manager.
    */
-  public function __construct(array $configuration, $plugin_id, $plugin_definition, RounderInterface $rounder, PriceSplitterInterface $splitter, ConditionManagerInterface $condition_manager, EntityTypeManagerInterface $entity_type_manager) {
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, RounderInterface $rounder, PriceSplitterInterface $splitter, ConditionManagerInterface $condition_manager, ChainPriceResolverInterface $chain_price_resolver, EntityTypeManagerInterface $entity_type_manager) {
     parent::__construct($configuration, $plugin_id, $plugin_definition, $rounder, $splitter);
 
     $this->conditionManager = $condition_manager;
+    $this->chainPriceResolver = $chain_price_resolver;
     $this->entityTypeManager = $entity_type_manager;
   }
 
@@ -90,6 +102,7 @@
       $container->get('commerce_price.rounder'),
       $container->get('commerce_order.price_splitter'),
       $container->get('plugin.manager.commerce_condition'),
+      $container->get('commerce_price.chain_price_resolver'),
       $container->get('entity_type.manager')
     );
   }
@@ -324,6 +337,11 @@
         }
 
         if ($order_item->isNew()) {
+          $time = $order->getCalculationDate()->format('U');
+          $context = new Context($order->getCustomer(), $order->getStore(), $time);
+          $unit_price = $this->chainPriceResolver->resolve($get_purchasable_entity, $order_item->getQuantity(), $context);
+          $order_item->setUnitPrice($unit_price);
+          $order_item->set('order_id', $order->id());
           $order_item->save();
           $order->addItem($order_item);
           $order_items = $order->getItems();
@@ -389,6 +407,7 @@
    * @param array $condition_configuration
    *   The condition configuration.
    *
+   *
    * @return \Drupal\commerce\ConditionGroup
    *   The condition group.
    */