The UV bulb are ballast-less florescent bulbs. The lamp itself has a ballast/transformer in it's base.
If it's any help, here's where I bought the bulbs on ebay:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=120592878330&ssPageName=STRK:MEWNX:IT
If it's any help, here's where I bought the bulbs on ebay:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=120592878330&ssPageName=STRK:MEWNX:IT