DEKO material - Kunst MaterialLager (NK and Pankow)
Hey, there is this organisation which collects leftover materials from other companies and then sells them cheaply to the public (approx. 1/3 new cost, they say). When I was at the branch in NK 10 days ago they had LOTS of thin (new) carpet for 1 euro/m2....purple, red, blue, green...great price. And LOTS of other "art material stuff".
NK is only open Tuesdays, Pankow: Wed & Fridays.