Neon Mart via Amazon offers the LE 100-LED Pet Urine Stain Detector Blacklight for $14.99. Coupon code "PZCW439D" drops it to $11.99. Plus, Prime members bag free shipping. That's a buck under our March mention of a similar light, $7 off list, and the lowest price we could find. It's water and shock resistant and requires six AA batteries (not included).