Err American retailers regularly charge 40 USD to ship to Canada (52 CAD). So 30 (CAD?) ain't so bad.
That said, I don't buy from retailers charging 35-40 USD shipping to Canada.
With the brands I follow ssense is about 20% more expensive than just about any other retailer I can find online. It also explicitly says it is USD so it seems like the conversion isn't necessary.
I didn't realize there is a 20% import fee to buy from canada; you charge that with your shop as well?