parts for sale

That brokerage fee is all bullshit. All that is, is the private shipping company collecting the Goods and Services Tax, (aka GST) and provincial taxes (if applicable) for the government. They base their fee on the value of the goods being shipped. It is one of the biggest hidden costs of shipping. Anybody that imports into Canada once is bitten by that, after that, they use USPS. No fees, just the taxes.
Too late for you, but that brokerage fee is a buyer problem - not a seller problem.
USPS and Canada Post is the way to go.
Daryl