USPS
small flat rate box
$4.95 interstate
$11.45 mexico and canada
$13.45 everywhere else in the world

medium flat rate box
$10.70 interstate
$26.95 mexico and canada
$43.95 everywhere else in the world

Large flat rate box
$14.50 interstate
$33.95 mexico and canada
$55.95 everywhere else in the world

Others depend on where you reside. I ship live fish with FedEx 2Day Home service. They ship cheap and take good care of the packages.