Mine came from superbrightleds.com.
I've been using their 20mW 400nm model in a custom ultraviolet flashlight for almost a year now. I also have the 405nm version and both have the same basic effect as a UV party lamp (just scaled down, of course). There's noticeably a lot more purple in the hue than a party lamp, but the effect is still there. But, they have spectral plots for all their products on the site.
I don't know how much illumination you need, but they also have 200mW version in a large LED assembly called an XLamp. The XLamp is basically the high-powered LED, plus the required heatsink, plus an optional parabolic reflector like they use in mini flashlights.
In fact, all their LEDs are really good. They have a lot of LED devices you can't find anywhere else, they carry the unusual hues like UV, violet and warm white, plus they shipped everything to me within 3 business days.