If you love the look but cannot shell out big money for a real vintage, Anthropolgie has some great options right now...
Cathedral Lantern - $58
Caged Light Lantern, Barrel - $198
In their current state, they are just for candles - but that doesn't mean they won't work as pendant lights. All you need is this:
A little chain and a ceiling canopy kit/hardwire light kit, like this, and you're set! A pretty, inexpensive alternative to the real thing :)