http://www.heartlandamerica.com/browse/item.asp?product=maxlite-12-pack-spiral-lite-bulbs&PIN=37480&GUID=9B84FC15-F4BD-4410-B9BD-04460DFFB83C&BC=S&DL=SEH2
Heartland America has a 12 pack for $30 with free shipping in the US.
They have a bunch of other cheap things as well, like oil filled heaters.
