I'm fairly certain that Black Widow, "Devcom" are no longer in business. I think it may be difficult to track down parts for this now, and it may be wiser to buy new. This of course depends on the model number you have and the cost of it new.
Saying that though, one of the forum users may be able to direct you to a source for the lamps. this link will show you how to strip down your scanner for repair/cleaning. click here