Checked with our PO Kevin this morn. He said I can send the flat rate boxes, but it won't be the flat rate price. He said he would have to weigh it and fill out forms take 40 min in our little PO. He said it could run 40 to 50 bucks for a large flat rate box. Don't see why. Just got some embroidery thread I ordered from England and it wasn't a real big shipping rate. Also got in less than 2 weeks. Was supposed to be sent in June til Jul6 and got it today. I guess the only way to find out for sure is to take a pkg and have him do all the necessary steps.