cmdstore's website is also a Canadian-based option. $75 plus tax and shipping.
https://www.cmdstore.ca/products/tra...-optimus-prime
I have not dealt with them, myself. Pascal recently posted that he has dealt with them directly with no issues. They seem to have postings on Walmart and Amazon as a third party seller, but the markup is frequently high.
But, based on hearsay posts on these boards, it could be a better option than northmen.