If you want a decent source of UV for not too much money, try Home Depot. They have (at least around here in the DC area) GE fluorescent black light fixtures. The tubes are about 18" long. The whole set including the cord, switch, and ballast is about $16-18. A couple dollars more than the bulb by itself. I bought six of them and screwed them onto the bottom of a shelf. I use the shelf below as my exposure stage (for pt/pd). With the six fixtures, I can print up to 11x14 easily, and I could probably manage a 16x20.
I wouldn't use a home tanning unit- they emit too much of the harmful wavelength UV light making them a hazard to be around.