Wondering if any US or Canada sellers have used ShipByMail.com to ship their orders? It seems that they have good discounts within North America and the world.
No, I haven't used it. It looks like they are a Freight Forwarder for buyers outside of Canada. I don't know if it would work for sellers sending to various addresses.
Looks like they have an address reasonably close by for you. Not so much for anyone anywhere else. I would be nervous about the add on fees. Best to talk to them first before leaping in head first.