Shipping to Canada is $8.50. You can see the shipping charges by clicking the button to join, and then just not joining. It's a horrible system for finding shipping costs, but Massdrop seems committed to inconveniencing their customers this way, then refusing to respond to questions about it.
Customs is a luck-of-the-draw situation. Massdrop doesn't collect duty, so you only end up paying it if it gets charged at the border. Sometimes it is, sometimes it isn't. When I ordered this last time it dropped I didn't end up paying duty, but that's no guarantee that it won't happen on future shipments. If duty is assessed, it's usually around 10%, +GST, +$5 or 10 handling fee.