It depends if we have the time to mail it to ourselves after we cross the border or if we have to do it while still in Canada - one of those buckets would cost, I'm guessing, $100 from here. So that would be $200 for the buckets. This is why we want to just resupply once - it will cost like $400 just for the buckets let alone the charge to hold them.
Dude! You can stop in at any USPS Post Office and mail it. It would take just a few minutes! There is one in every town, so you will pass by dozens on your way south.