The problem is making sure the buyer uses the same Buy Button as the affiliate link they came through. I guess if you set up a separate page for each incoming affiliate link it shouldn't be a problem.

May I suggest you read the "terms of use" of each of the sites you mentioned? They will tell you what they allow and what they don't.

Steve

Thanks guys for the suggestions I will read the Terms before taking action.

It they allow then I will surely setup three different sales pages.