Actually, shipping for irregular shaped packages, especially guitars, which are not according to their specifications, actually end up in the regions of more than a hundred. Even more so if you're using one of the premier courier services, other than USPS.
The best solution, is to take a holiday, go to the US, and to lug it back yourself. Or if you've got family there, ask them to bring it back for you when they visit. IMHO, of course.