Option 1) Order to a PO box service like U.S.Address, or CBI - they charge ~$5 per tire to receive them, the border usually won't care to pull you over for taxes unless you're bringing back 80-100 worth of non-grocery items. So I may take 2 trips (I get gas there weekly anyway) and pick them up 2 tires at a time - If tax needs to be paid, it's based on the price you paid, so paying 13% on ~120/tire at the border vs 13% on ~160/tire in Canada.
Option 2) Contact a garage just over the border and see if you can schedule your tires to arrive there a few days before you do - have them swap your tires while you're in the states... drive back on them = nothing to declare. -> which is where I am currently, hoping I get replied to soon or I'll just go with Option 1
View my fuel log 2015 Micra SV automatic: 7.1 L/100 km ... 39.9 mpg (Imp) ... 14.1 km/L ... 33.3 mpg (US) ...