I agree with Steve.
I purchased my engine from
https://www.motorizedbicycle.com the American side of their company. I wanted an original made Gru-Bee engine
Link HERE and they are one of the few dealers in the US for this Factory.
I paid $144.00 free shipping and in about 5 days my engine arrived. They shipped it from Canada. No complaints so far with the engine. they may not have the vast inventory as some of the other vendors but they were an easy effortless transaction.