I have an ergonomic keyboard custom made from Keyboardio. It was a Kickstarter-funded project that took 2 years to complete and once I got it, I realized I just don't have the time to re-train my hands how to type correctly.
I have used this literally 2-3 times, it is basically new. They sell for $350+ on Keyboardio's website. https://shop.keyboard.io/products/model-100
Don't get me wrong, this keyboard is awesome....so long as you're used to or willing to learn how to type ergonomically. This version is the walnut solid wood enclosure with Speed Copper Tactile switches. It feels great to use, but the ergonomic design has alerted me that I don't actually type "the right way" and I have found with my job environment I can't afford to be constantly mis-typing.
If you're a keyboard enthusiast or used to ergo setups and want a very detailed, custom built, amazing quality keyboard, this is the one. More info here: https://shop.keyboard.io/pages/model100
Comes with the 2 keyboard pieces, the connecting ethernet cable, 2 translucent keycap sets for replacements, tools to change and clean, the angled swivel stands, and a hardcore protective case.
I've knocked it down $100 bucks from the retail price simply because like a used car, as soon as it became "used" it loses that value, but there's not a single smudge on the thing.