The same seller now has the tender for sale separately, also at $67. $140 is pretty steep (for both pieces). They used to sell for a lot more, but lately they have been selling for $100 or less. There's a complete one with just a broken drawbar for $114.95 right now.
And remember, you still have to "Americanize" the heck out of it to make it into a US prototype.
It has a very European look to it.