If you want something inexpensive (but good) there is lots of information online on DIY spring reverbs.
But if not, on the high end, Gamechanger Audio, who also make the Motor Synth, is just about to start selling their Light Pedal. It costs $300, i think. They have changed the design of the spring reverb to improve the harmonic response. I posted about it before in the NAMM 2020 thread.