From a quick Google I got:

>When I got my K7xx, they didn't ding me. However, other items over time they have. I'm not sure what's their criteria. I will say, in general, the smaller the item, the likelier they will just let it by. However, if they do decide to value it, you will be charged $9.99 (fee) + HST/GST on (CAD$ converted value). There was no duty on my audio gear. 

There's also another guy in this thread saying he wasn't charged for importing something to Canada. I'd expect to be charged but it's luck of the draw to an extent.

That doesn't sound unreasonable to me. I am European, I currently live in Thailand, in both importing stuff from outside we need to pay customs duty, VAT and the shipping company handling fee.

$10 CAD plus only the GST (5-15%) just doesn't sound unreasonable to me. Most of this is tax, that's a thing we all pay, this is what gets you schools and healthcare. It's still a good price for this headphone.

I explicitly said, expect to pay VAT on import. Sometimes, depending on country, it does just slip through, but I expect to pay it on anything I import. You pay it on anything you buy within the country, it's just baked into the price by the importer already (in every country that isn't the US or Canada, prices are quoted tax inclusive).

I paid $60 shipping on a headphone from Adorama, $105 from Audeze. The tax and shipping company fee is on top, I still have to pay that. And with couriers like these use, it's unavoidable, they always charge you. If something is sent USPS as it sounds like Drop do, there's a chance it won't be charged.

So yes $15-20 looks very reasonable.