The one near the works? been there a few months, i dont think most are 2nd hand (although a few are) think they are just old ones that other stores want to get rid off.
Its a good place if you want a few cheap old CDs that you cant find in the supermarket or HMV anymore.
It's worth a look through the box of ones without covers for 49p each as well... not long ago I got Lateralus by Tool, both CDs of the Orb's remix album, and both CDs of Carl Cox's FACT album. Not bad for a couple of quid.