This is perhaps the best budget action camera for ActionStitch right now. A 1/1.28″ sensor and 4K50fps for $180 is already a good deal, but they seem to be running a promotion with an automatic 40% discount (even though the page says 30% off). That brings the total to $216 for two cameras:
XTU S7 Pro Max 4K Action Camera | AI ISP & 1/1.28" Sensor – XTUCAM
I’ll buy two myself to test them out and let you guys know how they perform.