Used CD stores in Berlin

so one been in Berlin a week & actually made it to see Hansa Studios. Now looking for recommendations for good used CD (70's Rock. Soul, etc) stores in the General area - Potzdamer Plazz - checkpoint Charlie ? Anybody?

 

The best vinyl shop in Berlin! The first occasion when I strolled in here I discovered three records I've been looking for quite a long time. Splendid backstock is their claim to fame, yet their new records are spot on point too. An extraordinary spot to purchase vinyl of any kind you like. I'm snared on the back room: techno, house, negligible and past.