Home Depot. Look in the small flashlights, there's a small UV light (Defiant brand), four inches long. It's awesome for finding scorpions before they find you. Scorpions glow yellow with the light, even from a distance.
Hello Sandchip. It seems that after asking the question, the OP fell off the face of the earth.... I hadn't thought of using these lights for checking bottles; great idea. I have also seen these recently at Walmart. Different brand, still about ten bucks.