The bulb you need is widely available (including on ebay for $19.84 plus shipping and any applicable taxes):
Purely Enterprises PUVLF356 Germicidal Lamp 16 Watt T5 4-Pin UV-C T5F Base
Type: Posts; User: genericbulbs
Search: Search took 0.01 seconds.
Results 1 to 1 of 1
Used Equipment - Buy, Sell, Save!