Today is the last day. Ends at midnight, not sure what time. So if you're gonna want to get in on this do it now.
I bought it this morning after debating on and off for about a week. I'm a soccer guy, the only other NBA game I owned was on gamecube, NBA street, and I have to say this game is freaking AWESOME. Have not tried multiplayer but for the single player career mode and playing with friends offline as they come over a lot this is worth the $10 alone.
If you're on the fence, I'd say make the jump.