A startup idea

Maybe this already exists... I know there are gift card trading sites, there ought to be a rebate trading site. I just bought a gadget at Fry's that has a $25 rebate that I don't want to redeem because it requires filling out a form and providing personal information that I don't want to hand over. But I should be able to give the rebate receipt and the UPC code to someone for, say, $10 and they can redeem the rebate and pocket the $15 difference.