Manhattan – SoHo
21 Spring St between Elizabeth and Mott Sts
It may seem overly specific, but a shade can elevate a ho-hum lamp base (which can always be slicked up with a coat of spray paint) into something worth displaying. This Nolita shop packs in more than 300 varieties of shades (they range from $15 to $325), most of which fall into about ten design styles (from drum to Bouillotte). If you don't see what you want on display, or you want add-ons like beads and tassels, they can also custom-design an offering, which takes about six weeks.
Find more shops at Time Out New York.