As you may already know, there is four common type of sports cards. Regular, Memorabilia, Oversized and Graded. There is in fact more, but strictly based on a shipping perspective those four may
📙 KRONOCARD - Shipping
A collection of 5 articles
You can find the Canada Post fees here: Canada Post
This document contains images to print in 12×18 format. Those shipping plates will serve you for shipping your cards. You can have them printed cheaply at Costco or Walmart.
Here is a quick video tutorial that show you how to ship using Kronocard. With everything correctly structured and because you are using Kronocard you will be able to ship your orders faster and more accuratly.
Here you can find a shipping sheet to help you keep track of your shipping day when using Canada Post: Shipping Sheet