Just to relate my experience with shipping into Canada, I received my emonPI system from OEM via RoyalMail and alternate CT’s from Byram Labs (US) via USPS (US Postal Service). These both came directly to me, without additional charge or paperwork. Not entirely without hassle though. The CT’s were originally delivered by UPS, COD, with excessive brokerage charges. I refused the shipment; they went back to the US; I phoned Byram Labs and they reshipped via USPS. No further muss or fuss or charges.
I recommend Byram Labs for Wattcore CT’s. They have a large selection and were very helpful.