Some dealers occasionally jack up the prices on those Nichia LEDs, it's usually cheap to buy straight from Nichia nowadays.
As for those power freaks, NVSU333A is much more expensive ($150+ and yup I asked), but is one of the most powerful emitter, so powerful the user can get the sunburn from it in as much as few seconds and it could get Fluorescein dye to possibly lase. It's rated for 3.6 Watts of 365nm UV. I am good enough with NVSU233A LED however as it's both cheap and quite sane (4 Watts NVSU333A LED has to be mounted on a large heatsink, at least XHP50 starboard is usable with this LED - it runs almost as hot as the AMD Athlon XP CPUs of the past - about 18 - 19 Watts TDP).
EDITED: ZWB2 visible light - blocking ultraviolet filter do Nichia NVSU series UV LED a good deed since it gets rid of dull purple light. I have 20mm ZWB2 filter installed in the custom Convoy S2 flashlight with NVSU233A-U365 LED installed inside, and do it make such spectacular difference - purple light occasionally hide certain fluorescence. I have an unfiltered UV flashlight with the P60 dropin containing NVSU233A LED, and there are some visible purple light. I will use unfiltered one to cure the glues.