Have 11 120 spools with backing paper that I can ship USPS first class. $0.40 plus shipping for all of them, paid via paypal, assuming . The package weighs 8 oz. and ships from 55401.
I realize this sounds weird, but if you pay via paypal, I can do first class postage online. Otherwise, I have to make a trip to the PO. The 40 cents just covers the fees at my end. And cheaper for you than shipping via priority mail.
Of course, if you want to mail me the postage, I suppose that works. Or pick up for free in Minneapolis.