Ok, so I just sent some Solly Gun Labs, 174cm's from Portland, OR to Boston. I realize this is as far across the US as you can go, but I was shocked that shipping was $30 (USPS priority). The skis had no bindings, were in a perfectly sized box, and the box was flat, so it didn't even really have four sides. Basically, they were packed as minimistically as possible.
What gives? Is there some cheaper shipping method I'm missing.