I've heard that e-bay is PPC, so is there more companies that work like Amazon' Maybe they are better and easier? Maybe with a longer lasting cookie?
You can work with prosperent. They are affiliate program that is with cj.com, sas, GAN, etc. They are preferred with all of them so you get access to every product from every merchant and all you have to do is put ad block up on your site and it will match the products. The cookies all depend on the various merchant cookies underlying it. They posted an interesting chart showing the average days to make a sale. It shows how important cookies are.
I can also vouch for the site advertised above. Amazon has low commission rates and they can be damaging to your success. I feel your pain.