Hey Eric, For myself, if you've already got small shipping boxes for them, go ahead and send mine like that.
If you don't have shipping boxes already, and it can be easily placed in a padded envelope, with cardboard/bubble wrap? That works for me too, and I'll roll the dice with USPS and Canada Post, I'm not worried about any money back from the difference in cost; I'm very grateful that you're doing this.
Tks very much
Kelly