My fellow developer and good friend Scott over at www.thatsoftwareguy.com has come up with an interesting system to allow discounts up to 100% on products when purchasing other products.
For example, you can set up:
Give 100% discount on “The Matrix Reloaded” when purchasing “The Matrix”. In this way, it is like giving a free gift.
Here is the admin interface for setting up these offers:
And here is how the discount shows in the checkout:
And here is a video:
If you are interested in this addon, contact Scott directly.
Installation is super-simple, and you can extend it very easily by having a page or something more cool showing the offers…