I have an Energizer single AA flashlight that was on clearance at Marshall's. It was intended as a cheap Christmas gift for me. However, it turns out this flashlight is bulletproof. It's rated at 45 lumens, but that makes absolutely NO SENSE to me because its brightness is really close my Fenix LD10 rated at 120 lumens. It has a push button that's better than than the button on my LD10. It's a bit larger and heavier than it could be, but it's construction feels like I could drive my car over it, throw it in a pool, and then fire it up.

EDIT: I found it on the Energizer website!

http://www.energizer.com/lighting-products/hardcase-tactical/Pages/1aa-handheld.aspx