I looked around for a while for an affordable reading light that was slim, bright, and could be easily used with my kindle or any other book. I found this light and have been using it for a little while now and I must say, it is excellent. Plus free shipping (it comes from Hong Kong so the shipping took a little while but you can't complain with that price). I hope you guys find this useful for your kindle/reader. (p.s. there is some awesome stuff on that site and it's all free shipping.)
edit: for those that want a rechargeable light, you can get lir2032's instead of cr2032's and recharge those. The price is still pretty dang cheap even with the cost of rechargeable cr2032's. just my 2 cents.
http://www.dealextreme.com/details.dx/sku.26822
