https://kinesis-ergo.com/shop/savant-elite2-triple-pedal/
https://xkeys.com/xkeys/footpedals/xkfootrear.html
(And if you don't mind a crippled non-programmable firmware, you can get it cheaper as a VEC Infinity IN-USB-2, and run a daemon on your laptop to translate joystick-style button events in to keyboard events.)
https://kinesis-ergo.com/shop/savant-elite2-triple-pedal/