I do not know what MTH's contract with FEDEX is but they do use a variable price scheme for shipping. RK $17, Premier Steam $20, shipping 2 of the same in a single box only goes up about 25%.
But the minimum is around that $9.75 to $10.50 range because they do ship FEDEX.
I would call or e-mail Midge and ask what is up with the Website shipping fee. I think that may be a mistake. I would expect you to pay around $10-$13 depending on the type of parts and size of box required to ship it in. G