Do anyone know which E-Commerce or CMS system have discount add-on or application as following Discount on certain quantities by category For example, Category Name: 3 for 100 Each Item Price = in range $40-$55 If client add 3 items (can be same items) from the category, in cart will update or discount to $100 for 3. If client add 4 items (can be same items) from the category, in cart will update or discount to $100 for 1st 3 items and the 4th item will remain same price. If client add 6 items (can be same items) from the category, in cart will update or discount to $200 ($100 for 1st 3 items and $100 for 2nd 3 items). Buy X piece items free Y piece item by category For example, Category Name: Buy 2 free 1 Each Item Price = in range $40-$55 Item A = $40, Item B = $50, Item C = $55 If client add 3 item A to cart, cart will update 2 item A $80, other item A will be $0 or free. If client add 1 item A, 1 item B and 1 item C to cart, cart will free for the lowers price item which is item A, so only charge $50+$55=$105 If client add 2 items B and 1 item C to cart, cart will free for 1 of the item B, other item B will still charge with item C. If client add 4 items to cart, only will charge for free for 1 item (lowest price). If client add 6 items to cart, only will charge for free for 2 item (lowest price). What are my options