I know you singled out chairs and desks, but let me also throw out a plug for the ergonomic keyboard I use. This keyboard is probably the reason I'm still able to work in the industry today.

The Microsoft Ergo Sculpt keyboard is amazing. It's very comfortable and doesn't require any getting used to, because it has a standard layout, and your hands sit in roughly a standard position when you're using it.

It's compatible with both Windows PCs and Mac/OSX. One point of caution, however: I have found that only some of them work automatically with my work Macbook. I've noticed that the USB transmitters come in 2 varieties: one that says 'Microsoft', and one that says 'Logitech' (IIRC). The ones that I've had good success with on the Mac are the ones that have the Microsoft transmitter. If you're just using it with a Windows PC, it doesn't matter which one you end up with.

Here's a link on Amazon to buy it for $70: https://smile.amazon.com/Microsoft-Ergonomic-Keyboard-Busine...

Seriously, if you're not already using an ergo keyboard, unless you're one of those mechanical keyboard gearheads who obsesses about colors of switches, you'll probably like it. I guarantee it will kick the socks off of any built-in laptop keyboard, and it's better than most wireless keyboards, IMO.