We were in Rostock and Lübeck.
Bahr Rostock, here we found the most variety and it ranged between 100-150kr/sqm. Carrara marble 290kr/sqm
Hagebau Rostock we didn't find much more than our kitchen floor, terracotta tiles with small decorations.
Toom Baumarkt Rostock we found good lamps and such.
Hussmann Lübeck, worth a visit. Specialized in tiles and ceramics. Delivers to Sweden. Prices vary a lot here. They have a room with just marble slabs that is incredible. Some types of marble you've never seen before.
Hülsmann Baukeramik GmbH & Co.KG Fliesen (04 51) 5 40 16
Kronsforder Allee 150
23560 Lübeck
Obi Lübeck, had a few. We didn't find it that interesting.
Summary: where we found the most in the price range 100kr/sqm was at Bahr Rostock.
Then we visited Möbel Kraft. It is a huge store like Ikea but much better. It is located about 30km west of Lübeck. Really worth a visit. Here you find an enormous kitchen exhibition from different suppliers, incredible kitchens. Bathroom furniture, furniture in various styles, lamps, bed linens, curtains, etc. Enormously large.
Kraft Möbel
Ziegelstr. 1
23795 Bad Segeberg