i got mine at gasbike.net, however i wish i would have gotten it at spooky tooth, as they are real experts and have great customer care.
but if you wait for black friday, on gasbike, they will be like 110 shipped!
I've learned the hard way with some other non-MB related things that going with a dealer with a positive customer service record is worth the extra money you might have to pay.... not that I've ever dealt with Gasbike.com
Bike Berry is to be considered. 2 times I've placed an order for complete engine kits from them. I'd gladly order from them again. Delivery was quick & prices reasonable. Both engines have held up. N'uf said.