Fust for electrical/white goods
Otto's for furniture, sometimes white goods
Miscasa (Migros furniture/bedding)
Top Tip (Coop furniture bedding)
Aldi and Lidl also often have bedding and white goods in their weekly sales.
Check in the For Sale section in the Market Place part of the forum as lots of members here have all sorts of things for sale too.
Another place to try if you don't mind second hand, but good quality stuff, is www.hiob.ch