Ok, I just got back from a local TRU here in Houston.
I hit the gaming section and what do I see? A discount bin chock full of GBA, DS, Xbox, Gamecube, and PS2 games. All marked $9.99 and under. I then make my way to the DS section and to my surprise, they have all the games marked BUY 2, GET 1 FREE!
I asked the guy if this included the marked down games and he said "YEAH." Long story short, I walk out with:
Tomb Raider Legend
Freedom Wings
*Bust-a-Move DS
*edit 7/1/07- Turns out I forgot I already owned Bust-a-Move DS, so I exchanged it for a $9.98 copy of Tony Hawk's American Sk8Land.
All for a whopping $21..and they had other games that I wouldn't mind going back and picking up as well.
So, check out your local TRU....but be warned this might be a regional thing...or even just this specific location I went to, so your milage may vary!