<<Disclaimer: Verify this information before applying it to your situation.>>

I received a fairly good number of responses, (Thank you to all of you) but
none was specific saying where exactly order garfave flour in Canada.
However, I was glad to receive this post from Authentic Foods:

Dear Mireille Cote,

I am sorry to inform you that you did pay for shipping.  Your shipping cost
was $18.80 US dollars.  Your total bill was $58.70.

If you still have the invoice for custom fees, would you please fax me a
copy?  My fax number is 310-366-6938

I am sorry about this custom fee charge.  I will investigate a better way of
bringing you the product at a lower cost.

Sincerely,

Steven Rice
Authentic Foods

What I will do today.

That proves they read this Forum and are attentive to well serve their
customers.

Will tell you when I will be reimbursed.

Mireille, Waterloo Quebec.