Logitech K750 Solar Keyboard | $45 | Amazon
Graphic: Shep McAllister
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What if you never had to charge your wireless keyboard? That’s the idea behind the Logitech K750, which uses a strip of solar panels to soak up the light in your office and keep running essentially forever. It’s like the calculator you used in school, but a lot bigger.

It normally sells for $50-$60, but Amazon’s marked it down to $45 today. It has dropped to $37.50 on a few occasions (mostly Logitech Gold Boxes), but otherwise, this is a great deal.