eguns.com ships to Canada,pretty good company.
U.S. retailers usually don't export due to U.S. export laws. They need an exporter's licence. It's not the same thing as the export permit.
Major manufacturers like Dillon, RCBS etc, usually, have a Canadian distributor. Selling directly would violate their agreements/contracts with their distributors.
There's very little available Stateside you can't get here without all the Customs BS. Customer service(parts) isn't the same thing as selling.