Possible free Shipping Tuesdays for buyers in Canada and in USA:
CanadaPost offer a promotion of one free shipping within Canada and one free shipping to the USA in October:
4th October: one free shipping within Canada available
4th October: one free shipping to the USA available
11th October: one free shipping within Canada available
11th October: one free shipping to the USA available
18th October: one free shipping within Canada available
18th October: one free shipping to the USA available
25th October: one free shipping within Canada available
25th October: one free shipping to the USA available
Limits for parcel shipped within Canada: up to 5 kg. (actual or volumetric weight).
Limits for parcel shipping to USA: up to 2kg (total Length + Width + Height
You need to request via "submitting a quote request" to see if your order can be shipped with this free shipping promotion.
Qualification for free shipment:
1) your order cannot be sent with mailer.
2) you order and pay before the day before Tuesday (i.e. Monday).
3) priority will be given to those whose order's total value is higher and/or heavier (but upon request, it is possible to create the free shipping label on the following Tuesday if available)
4) insurance is only free up to $100 CAD but you will be charged for extra insurance.
For info:
https://www.canadapost-postescanada.ca/cpc/en/business/shipping/free-shipping-tuesday.page#