Bohemia - Crap Shopping?

So, I'm Czech-ing out the capital of Bohemia - Prague - in a few weeks. It's a place I've wanted to go to for oh so many years, and has a lot of great reasons to visit, but it doesn't seem like record shopping is one of them.

Can anyone here prove me wrong? Are there any places in Prague that sell good, even hard to find records at acceptable prices (but no counterfeit shops, please). Bricks and mortar stores, flea markets, hypermarkets, anywhere - I'm not fussy!

Come on, help a brother out!