Yup, Pawn shops are a pretty good bet. Car-boot sales are where i pick up most things old, although with that damned interweb thingy, most people there know the worth of stuff. Still goes cheaper than retro stores or e-bay though. This morning, i found Super Mario Advance 2 for GBA (boxed and in mint condition for £5, its going for £10 cart only on the bay and up to almost £30 in this kind of condition) and Probotector, Snake,Rattle & Roll and Rygar for NES (unboxed but £2 each).