To everyone having problems with the game scanning at $49.99:
I went in yesterday and had the same issue, so I came home and checked the forum and saw what people had said about it needing to be totaled for the discount to apply. Not wanting to miss out on this deal I went back to the store today and asked the guy to total it; it worked, he was more shocked than I was to see it total at $24.99. He then applied the coupon and blammo, I got the game for $17 with tax. Though I wasn't as luck as others when it comes to buying multiple copies; he would only apply the $10 to one. Oh well, at least I have it now!
So yeah, to Naryan and everyone else having problems, even if it rings up as $49.99, once the cashier hits total the discount will be applied. I am going to assume this lasts until the 30th, as others have said.
Good luck!