TopBucks does that. Basically you have to provide your email address and select an access option before you get to see the prize of what you just selected. Seems totally idiotic to me, but then again I read mostly nice things about them on the boards and elsewhere so I guess they must be doing something right. I reviewed all of TB's sites for a review site and felt obliged to mention the actual prizes in most of those reviews. Information wants to be free!
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