There are separate registration forms for Canadians and US residents so you can pay in your own currency. There will also be a form in the next RootesReview.
If you will be traveling to Canada from the US please make sure you have investigated the rules for entering Canada and re-entering the US on your return. We hope to have some guidance in the next newsletter, but you should do your own preparation. This is a good place to start: https://www.cbsa-asfc.gc.ca/travel-voyage/ivc-rnc-eng.html