LED Wholesalers has a lot of UV LED lights. Just type in UV in the seach box and you'll see all kinds of them for sale. They have a 9 LED UV light for less than $15 delivered to most places in the US that has a wavelength from 362 to 397 nanometers (peaks at 385 nm). The wide range should be useful for making more things fluoresce than a light whose LED's are 400+nm. Here's their store link...
http://stores.ebay.com/LEDwholesalers-Inc
I have some cheapie 12 LED UV lights that I bought from the following eBay store. I bought 6 of them for ~$20 delivered and they definitely fluoresce the cat pee-pee in my son's room and other things as well. One of my son's girlfriends was over a few nights ago and she just had her feet done the night before for their winter formal. I was goofing with the UV light at night while she was walking through our kitchen and her toe nails fluoresced really bright. Everybody including her was staring at her feet until the silence broke and then we couldn't stop laughing. As I said, these are really cheapo lights and there's plenty of purple coming from them, but they do the job good enough for me and they're cheap enough to pass out for fun.
http://stores.ebay.com/SCALEDISCOUNTERS-LLC
I'm putting together a more serious UV light, but I haven't had the time to get anywhere with it. It's based on one of the 128 LED heads that LED Wholesales sells and I'm planning to drive it with lithiums once I build the tube. My brother-in-law likes looking for scorpions where he lives in NV and needed something with a larger and more powerful beam than what he was using, so hopefully this works out for him if I ever finish it.