That special form that your link leads to says that the "SPECIAL" trade-in price is $349.00 and like $15.00 shipping, plus a $50.00 security deposit that you lose if they don't get your old video card within ten days.
NewEgg has that card (retail box w/cables) for $355.00 and Free Fed Ex shipping so what's so special about this deal, other than you're getting ripped off???