The Logitech K750 wireless solar keyboard is now only $39.99 (was $59.99) on Amazon with free shipping.
This is perhaps the best keyboard if you’re looking for a wireless that never needs a battery replacement as it includes a solar panel that keeps the internal battery always charged by capturing the light from the sun or indoor light bulbs.
It’s only 1/3-inch thick, which makes it ultra-thin adding a sleek style to your workspace and uses a 2.4 GHz wireless technology. The black version of the K750 solar keyboard works with Windows 10, and previous versions (no for Mac).
Amazon has both versions, the black Logitech K750 keyboard meant for Windows users, and the white version for macOS users that sells for $56.56.