I have several Powertap G3 wheels. I think those were a fantastic solution and much cheaper than current meters. If you found a good used rear wheel with a Powertap G3, that is an alternative. But, you are probably going to have to learn how to replace the bearings yourself. It is not hard. I recently picked up a spare wheel for about 300 bucks with aero spokes, alu nipples, and a 45 mm carbon rim. It just needed new bearings. This is one alternative if you are handy. Swapping a rear wheel is pretty quick.
I looked at these mtb pedals and considered
https://www.iqsquare.com/
I also considered SRM MTB pedals but very expensive
https://powermetercity.com/product/s...r-meter-pedal/