It happens. Years ago I found both Lunar games for the PS1, complete, for good prices. Then a used Tomba, also complete (as is with anything I buy there). Rez, Ico, and SotC for PS2. I just came home with a copy of Trinity Universe for free after a coupon they sent.
GS may not offer the best sales but if you take time to look then good things can be found. Had 4 local stores, down to 3 now. One sucks 'cause it's small but the other 2 have a decent selection in a big store.