As one of its daily deals, THAT Daily Deal offers this Portable Stain-Detecting Black Light for $7.99. Coupon code "BL10" cuts it to $7.19. With free shipping, that's the lowest total price we could find for a similar item by a buck. This 6" light illuminates traces of urine, vomit, feces, and saliva. It requires four AA batteries (not included). Deal ends February 9.