I got this Arduino bot for $70. Has its own battery for sufficient power. The motor gearing is a bit fast, so it's better to use PWM to slow down the motors,

I got this Arduino bot for $70. Has its own battery for sufficient power. The motor gearing is a bit fast, so it's better to use PWM to slow down the motors, except the default pinout disables PWM on the drive gpios when the servo is enabled. The build quality is ok, except there are no spacers for the bolts between the PCBs and acrylic base, so I worry about damaging the PCB during assembly. https://www.amazon.com/Elegoo-Four-wheel-Ultrasonic-Intelligent-Educational/dp/B01DPH0SWY https://www.amazon.com/Elegoo-Four-wheel-Ultrasonic-Intellig...