How much does it cost to ship a mattress across the country?
Is it a new mattress - boxed or crated? If not, and that's the
only item you are shipping, it may cost you less to sell the
mattress and buy a new one when you get to your new location. If it
is boxed or crated, you probably want to get a LTL quote from a
company like ABF. There will probably be a 500 lb. minimum.