I got mine as part of a counterfeit bill detector kit at Staples. SpyGear also makes a set of secret message pens which write in UV-only ink and have little UV LEDs. You can also get blacklight lightbulbs pretty easily, although they're not as portable, of course.
Yeah, if you get that Urine Gone stuff it comes with a free UV lamp, but I didn't mention it because if you don't have a urine issue it's a $20 lamp. :)
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