(Apologies in advance if this is threaded elsewhere; a couple searches turned up nothing.)
I had no idea that Target accepted trade-ins of electronics, games included, before today, but I swung by my local Target and saw an ad in the story (that I neglected to snap a pic of) and then looked it up online.
Lo and behold, there's a Target trade-in program. The interface is clunky, and not gonna yield TIVs all that easily, but it appears that Target accepts 360, PS3, Wii U, Wii, Xbox, PS2, PS, DS, Vita, and PSP games -- because the program's powered by NextWorth (much more searchable interface, FYI), which buys the games.
You're not going to get a lot for them, especially the older games (I nosed around a little), but this might well be a sign that Target actually wants to compete in the secondary market. And, if this is important, you apparently are getting cash, not credit, for the games.