If you find some, do let me know 
There are lots of mechanum wheels for 4-wheel Omnidrive like the DJI RoboMaster… some are very expensive, while others are quite cheap.
I’ve never found any that would allow you to embed a 2208 motor to make a hub wheel - the wheel center is always too small. The best I can see doing is to get the ones without a Lego hub (eg the ones with just empty hubs) and print an attachment flange to join wheel and motor. But the motor will be external to the wheel.