osCommerce Better Together Admin

osCommerce Better Together allows you to pair items for discounting. 

You may specify

• Buy item X, get item Y at a discount
• Buy item X, get an item from category A at a discount
• Buy an item from category A, get an item from category B at a discount
• Buy an item from category A, get item X at a discount
• Buy item X, get another item X free
• Buy an item from category A, another identical item free

But in the free version, adding Better Together discounts requires editing a file and modifying PHP code. 

osCommerce Better Together Admin gives you a user interface to add every type of linkage that Better Together supports.