I've found a number of fantastic and unique lamps and chandeliers for clients on eBay. Unlike larger furniture items, lamps don't usually cost much to ship. Check out my current eBay favorites...
Lucite chandelier, Buy it now for $149. It's not the hottest deal around, but it would spice up a boring entryway or small kitchen.
1930's Industrial work lamp, currently at $32. This would make any work area shine.
I'm a sucker for these Art Deco headboard lamps. This one is in good condition and would be a unique substitute for a table lamp. The current bid is $10.
Vintage arc lamp, starting bid $9.99! This is a classic. The shade rotates to direct light wherever you need it.