Looks like the deal is dead from their forum post. You could still trade-in but it would be based on actual value, no promo.
http://forums.bestbuy.com/t5/Other-...D=d5058b84666b11e7a3b7c2ead178cde80INT#M30454
http://forums.bestbuy.com/t5/Other-...D=d5058b84666b11e7a3b7c2ead178cde80INT#M30454