I go to one in a mall near me. Mostly all of the new cds are overpriced. But used cds are reasonable prices. And they run promotions a lot such as buy one used cd/dvd and get the second 50% off or buy 3 used and get one free. I've bought a lot of used stuff there. I've never had any problems with the condition of the used discs. Most are in usually like new condition.
Some examples of stuff I bought there over time:
DRI - Thrash Zone
Dark Angel - Time Does Not Heal
Cathedral - Serpent's Gold (Complation)
The Best of Deicide
Destruction - The Antichrist
Saint Vitus - Born Too Late
Metal Church - Hanging in the Balance
Hallows Eve - Tales of Terror
Napalm Death - Utopia Banished
Zakk Wylde - Book of Shadows
Down II A Bustle in your Hedgerow