OLIGHT ArkPro Lite Flat Pocket Flashlight, Rechargeable Portable 1200 Lumens with White LED, Red Light, and UV Light, Triple Sources for Pet Urine Detection, Camping, Emergency, Working (Matte Black)

It's a bit above your price range (about $70) but the OLIGHT ArkPro Lite has a red light and UV light as well as the white light. It's flat so it's not too hard to carry, and it's surprisingly fun to shine a UV light at things and see what happens. https://www.amazon.com/dp/B0FGJG1V2N