how much is it to mail a medium flat rate box?
<answer> It costs from $11.30 to $12.35 to mail a medium flat rate box. <context> A common question asked includes: How Much to Ship Priority Mail Medium Flat Rate Box? The simple answer is that prices range from $11.30 to $12.35 and up. Did you know that ReadyShipper shipping software comes with Flat Rate Select included – which gets you the lowest possible prices on USPS Priority Mail?