I use the cateye "micro-halogen" which couldn't have cost over 20 bucks, and a Bell l.e.d. blinker, which was about 8 dollars. I recharge the batteries when they get low, and they'll put out light continuously for over an hour. In wet weather I put clear plastic bags over them. Well below a hundred dollars! Hub dynamoes and lighting systems would be on my price-is-no-object dream bike, but it's kind of overkill unless you ride a LOT in the dark.