If you liked the original IBM "clickey" Buckling spring keyboard, you can still get something very similar from Unicomp [1]. I have one and I love it because it has such a gradual force increase as you press the key. My fingers don't "bottom out" like they do on cheap keyboards. After many years of writing a lot of code I started to develop some minor pain in my fingers from using cheap keyboards every day. When I switched to this keyboard my problems gradually subsided.

[1] https://www.pckeyboard.com/