later learned shipping by postal service between US and
Canada may result in more reasonable/predictable import
fees as they are more of a set rate.

More than likely they have internal customs brokers to help clear the
goods. This is where the real delay will occur when shipping
internationally-it really pays for the buyer to have a customs broker
"hired" to get the package cleared and on it's way in the buyer's
country. Also, shipping companies often will have better service to
certain countries, and the buyer may have a recommendation.

John