Not sure if this is already known, but the MS store is giving $10 coupons for the MS Store (and XBL of course) when you buy launch games (all?).
I just ordered BF4 and Forza 5. They were out of NBA 2k14...but all came with the $10 coupon.
If you ordered them before 6 tonite (pacific?), they will arrive on Nov 22