Menard's. It's like a Home Depot-y sort of place. The fluorescent style twisty ones are about $8 for one that gives off as much light as a 100 watt, but only uses like 15 watts of electricity. The incandescent style are about the same price as regular bulbs. They give off a strange blue tint. My kids don't like them because they aren't as bright, but I like them

Sorry to hijack. They are good bulbs for faking sunlight though.