American Science and Surplus has a goofy Edison base neon bulb, the electrodes in the shape of the "trucker babe" you see on the mudflaps of semis. Cost? A buck seventy five.Their catalog is fun to read, and they do have quite a few cool things.
Wally World has a plasma globe for $19.95-lowest price I've ever seen one one, if you don't mind the furry claw holding the globe. It's in the Halloween section.