(*EBAYERS, PLEASE HELP!*) What is the best shipping method for a picture?

Question

I just started selling my items on Ebay, but i still don't know how to chose a right shipping for the pictures yet. So I was wanting to know what would be the best way to ship them? They are 14" wide x 28" long and weigh about 15-20 lbs! Also I was wondering, could a USPS Priority Mail Flat Rate box be used to ship them and if not, what would be a good shipping price to ship them to other states? Thanks for helping!

Answer 1

I'm not in the States but UPS seems to be the way to go over there.  I did send an Ebay painting once just using a normal interstate bus service - was very cheap.