Is the wavelength set in stone or do you just need something just outside the typical ultraviolet range? And what size, 3mm, 5mm or one of the many surface mount sizes?
I can source you 400-410nm 5mm LEDs VERY reasonable in 100 lots...
Not sure of the wavelength but I've gotten good deals from this site: http://www.mpja.com/products.asp?dept=116 $15 min order but shouldn't be a problem for 100 of them.