The Logitech Solar Keyboard draws its power from light so you can forget about buying AA batteries and charge it with the light of your workspace.
So few devices actually run on AA batteries these days that you never have them around when you need them. Instead of worrying about your keyboard's batteries, the Logitech Wireless Solar Keyboard charges up with two solar panels on the top. You don't need the light on all the time; once it's fully charged, it can (supposedly) last for months with no light at all. It even comes with a program that'll tell you how much power it is currently gaining from the ambient light, so you can play around with your lamp and find the optimal position for fast charging.
The Logitech Wireless Solar Keyboard runs for around $80.