If you like antiques, go to Atlantic Ave in Brooklyn.
You can get some great pieces of quality furniture at good prices at the PS 321 flea market on Saturdays & Sundays (1st Street & 7th Avenue in Park Slope). Crate & Barrel and Pottery Barn both sell hardy furniture (both at Houston& Brodaway).
Jensen on 7th Ave at 16th Street - Manhattan
There's a very modern furniture place an Park Ave South by 19th (?) Street. Very nice designs.
Any of these place (including the flea market) will deliver.