They haven't replied because they don't ship to Canada and don't work directly with any exporter who does.
Good news for you though, I recently brought a Rock Solid Industries scope mount into Canada.
Prophet River, IRunsGuns and Rusty Wood Trading Co will all bring it in but they charge a $200-$250 fee, yeah, even for a $100 item.
I found a company Borderview International Firearm Logistics (borderview.com) that's entirely based in the U.S. and export to Canada. The difference with these guys is that for accessories that fall into the ITAR exception with a value of $500 or less (this is the Rock Solid Mount) they only charge an import fee of $40 for the first item and $30 for each additional item. I got a scope mount and bolt into Canada for a $70 fee. This is by far the cheapest option .
Hope that helps!