I run Fleas on my helmet as well,but from other threads I think they're a bit more than the OP's budget.

Archery_Queen: are you looking for primary lights or auxiliary lights? Fleas are actually bright enough to be used on their own,but if you're just looking for extra lights,there's alot of little ones that can be strapped on to most helmets. PB has their Spoks,there's the classic Knog lights,and there's a bunch more out there.