Um. No it isn’t. Appx 90 miles to colchester. 80 miles to Sherbrooke. Drive time Sherbrooke Costco is faster - however - as someone else pointed out, after taking the crossing time into account - it is likely a wash. I would add that in addition there are certain items restricted at the border and quantity of some items may require paying a tarif. Personally I would just find somewhere local to shop. Especially for food.

Tires provide traction. The more you have the better off you are. Winter tires provide superior traction in cold and snowy conditions.

I’d suggest getting a set of winter tires along with a set of winter rims. Leave them mounted and tire changeover becomes inexpensive and something you can potentially do yourself. Both sets last more years and over time it is minimal extra expense to be safer year round when driving.