It's not locked to AT&T, but it wouldn't work on Verizon due to network incompatibilities. AT&T and T-Mobile use a GSM-based network while Verizon and Sprint use CDMA.
X-Men DVDs, spare Tetris cart, and a couple NES games are gone. Not going to add to the NES list at the moment but if there's a particular game you're looking for, let me know and I'll see what I can dig up.
Lowered the price on the broken PS3, added some Vita games to have/want lists.