Up here in Canada I use the post office service exclusively. I have found a large plastic envelope with bubble wrap inside. It works well with my kilts that I ship. The plastic is durable and the built in bubble wrap protects the kilt. The envelope comes with a pre-glued flap that really sticks!!
The post office has available a venture card for small business that gives a discount for shiupping or upgrades to the next level.
I have experienced one problem in a shipment overseas but they fixed it.
So far it works for me.
However wish I could get a 9.95 deal here that would be a bonus.
Cheers
Robert