$22.99 ($24.99 as of 09/10/11)
This thing is great! I read my Kindle in bed all the time and that would be impossible without this thing. I previously had the battery powered only one but quickly tired of replacing the batteries.
I've been using this for over 2 years now. It's working okay other than the adapter is a bit touche where it plugs in. Probably because it loops down at an angle and has probably broken a few cords making it short circuit.