The Kinesis Advantage contoured ergonomic keyboard. Once you've used it for a few weeks, regular keyboards feel awkward and uncomfortable. They are pricy and completely worth it.
The best non-mechanical keyboard I've used is a $20 Anker 84-key Wireless keyboard. It's extremely comfortable, and extremely portable.
"To disable the “click” noise, press and hold the Progrm key and tap the piples/backslash key (the key directly to the right of the letter “P”)."
https://www.kinesis-ergo.com/support/technical-support/faqs-...
I had to train on it with https://en.wikipedia.org/wiki/The_Typing_of_the_Dead for about 2 weeks before I was beating my usual typing speed. But after that, there's no going back.
No more wrist pain, ever.
The only thing that sucks is the rubber keys, especially ESC, especially for vim users. In contrast, having meta+ctl keys on thumbs for emacs users is huge.