I've never ordered from bitmain, but any hardware I've ordered has fallen into these 2 categories.

The shipped charged me in the purchase price to cover shipping, customs and taxes.

Or when the shipment cleared into Canada I had to pay a brokerage fee and taxes. This was through UPS.
The only reason I paid for them to broker it is the nearest customs office was 3 hours away and wasn't worth the drive. Depending in where you live you can go to the office fill out the paperwork and pay the taxes on the imported item.

Here is a government link about importing for Canada

http://www.cbsa-asfc.gc.ca/import/courier/menu-eng.html


Hope that helps.