Thank you very much! When you say "compatible with a power meter" - are there bikes that you can't attach an aftermarket power meter to?

If I can get a CHAOKE Indoor Cycling Bike (this) for under $100, would that be a reasonable idea, maybe just to see if we'll actually use it?

I can also get a Spinning L3, L5, or L7 for a very significant discount. Would those make sense? Can I use Zwift with them if I attach a power meter? Or, if I don't care much about power, just a speed sensor? Would the quality be worth the significantly higher price?