Poundland in the UK are stocking disposable lighters with built in torches. Powered by 3 hearing aid batteries, so should last and are surprisingly powerful. They are 3 for £1. Obviously not a main light, no sane person is going to bet their life on 33p worth of technology; but you can't have too many torches!
They come in and out of stock so try a week later if your local poundland doesn't have them.
qjs