I just picked up my Transformer locally this morning. It turns out the only stipulation for Best Buy or Office Depot is that a Staples within so many miles must have it in stock.
Best Buy, regardless of the location, will indeed accept this.I had both local stores deny me for the same reasons others are reporting. However, I looked online for the policy and it states to call a number, 1 800 Best Buy I think, to have them accept it. They will match it without question if a Staples within 25 miles has it in stock.
Office Depot was the same and strangely enough when the called the local Staples who told me they didnt carry it instore, told them they got some in. So they gave it to me for $299. Holy crap, for the hardware this thing has (software, has a little ways but I trust it will come) you really have to buy it at that price,$50 more than Nook Color, jeez, insane.. If you dont like it you can resell it on Craigslist for a decent profit. I love it. ( Oh wow i just noticed i can swype. Staff, sassy, away, as, SF, zag, (dammit ok, tough time registering the word sweet but still cool.)
TL;DR As long a a Staples within 25 miles has it in stock both Best Buy and Office Depot will take the coupon. If the local stores say no, call corporate, I verified this with them and have the discounted Transformer as evidence from Office Depot but was assured by corporate Best Buy that they would do it too