£599 with Samsung battery delivered from BestBike store on Aliexpress, I think it can take any square taper cranks, needs a proprietary chainring though. I am running it unrestricted but 350w and heavy cargo bike means it doesent go that mad fast. No brake or gear sensors.
Installed bafang on the cargo bike; love it. Took the kid on a lap of Q1; she fell asleep.