On ebay you can choose from several similar LED lights from dealers in China. I've used a few on my city bikes and they work great, battery time is very long. The front lights will give a bit of road illumination but they're main purpose is to make you seen. Here in Europe we also have very small key chain sized white and red LED units that can be attached with an elastic loop. I tie a white one in the spokes of my front wheel and a red one in the back wheel. This gives a lightshow to motorists approaching from either side that is impossible to ignore. These little units are extremely cheap... I suppose they must be available there too.
I found a lot of diferent stuff for the backlight on this website Twenga - US Price comparison site, shopping guides, user reviews, coupons, they hav tons of stuff from different websites etc..
And for the lights you have to be carefull, i know that this side of the pond (aka Europe) there are special regulations for the backlights.. I'm not sure how it works in the States, but here theyre kind of a pain in the arse
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