Went to the TRU in Sherman (closing around 4/1). Didn't find much, but picked up the last copies of Meteos and Viewtiful Joe DS for about $15 each. There's nothing worth picking up right now at 50%. Probably nothing until they go to 70 80 or 90%. They have multiples of all the games left pretty much.
Stuff I remember that's probably worth it is Battalion Wars (@50), Trace Memory, Pac Pix, Pac and Roll, Pac World 3, F Zero GP Legend (@10), Psychonauts (@30). Mostly a bunch of crap though, they have a million copies of the warriors (@50) and TS:FP (@50 for all systems). Oh yeah and Nanostray @30. Guides were also only 50% off, and they just have a bunch of Pokemon ones (LG/FR Prima, Coliseum), a couple FFIV Advance, a torn Mario and Luigi PiT, some sports games, and a few others. Nothing really notable.
If you're looking for DS accessories (like that pro gamer's kit) it's 70% off already. Also GB Micro Socks and a leather case.
It's off highway 75, exit 63. The exits distances are all screwed up though. From exit 39 in McKinney to exit 63 in Sherman is about 36 miles, not 24.