Some more info on the shop I posted about a few months ago:
MusicAndBooksKreuzstr. 13
80331 München
Tel.: 089 / 26 09 7 45
Open Monday - Friday 11:00 - 19:00, and Saturday 11:00 - 17:00
They buy stuff only on Wednesdays, 11:00 - 18:00.
Located close to
Sendlinger Tor, in the centre of Munich. As well as CDs, they also have a good selection of vinyl LPs and singles, DVDs and second-hand books. They also have two shops in Nuernberg, and they move their wares around between the shops every few weeks, so there's often new stuff in.