Upsell, Cross sell & Bundles

If you are looking for a 'Related Products' type app that gives you complete control of the products that you want to recommend to your customers on a per-product basis, I would highly recommend Cross-Sell.

The monthly cost is negligible and the developer went to great effort to ensure it was installed and configured correctly for our store (Thank you Stuart).

As another reviewer has said, they really do deserve as much business as we can give them. HIGHLY RECOMMENDED.