Canadian residents are required to pay the appropriate GST/HST, which will be charged and collected by ebay.
Shipping is as follows: Canada $4.00 for the first 1-5 items, $2.00 for each additional 1-5 items. US $12.00 for the first 1-5 items, $6.00 for each additional 1-5 items. International $13.00 for the first 1-5 items, $6.50 for each additional 1-5 items. If you end up being overcharged, I do issue refunds.