Sunvalleytek via Amazon offers the TaoTronics UV Flashlight
, model no. TT-FL001, for $12.99. Coupon code "TFE5WIWV" cuts it to $6.99
. Plus, Prime members qualify for free shipping
. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $6.10.) That's $23 off and the lowest total price we could find. It features 12 LED lights, can be used to authenticate bank notes, and includes three AAA batteries.