It's ironic, I used to order internationally all the time to the UK, but now living in Canada brokerage fees kill most purchases. Often $40 for processing plus taxes, duty and card fees and you never know when it will kick in.
Many stores , including Amazon offer fully prepaid services so no scares.
Was having the same concern with smart switches, but Inovelli started selling direct through Amazon.ca so that helped clinch the deal for them.
UPDATE: Bobby responded to my email and suggested a typical total shipping cost is $70. So my estimate of over $200 cad in total was low!
Hubitat needs to find a better shipper with prepaid options.