Deigote y tal: Huge place to buy beer in big cases. A price list can be found here http://www.getraenke-wick.de/Preisliste.htm (note that those prices includes transportation to your house)
Department Store · Ludwigsvorstadt - Isarvorstadt · 10 tips and reviews
Deigote y tal: The only place where, apart from a decent local selection, I've found some good export brews (Sam Smith's Imperial Stout, some Fuller's, even Sierra Nevada Pale Ale). Very pricey tough.