Advice for motors for kids?

My son is obsessed with Legos and motors and I am looking to buy him a good motor set for his technic sets. He has the technic bronco, jeep and others. We bought the lego powered up motor and hub but it never works right. Bluetooth never shows up, batteries die fast etc. So disappointed in the lego motor. Anyways, he watches YouTube videos and really wants buwizz motors but wow! Those are expensive! Can someone recommend something comparable? He’s 10 but pretty tech savvy and doesn’t like...