They do this frequently coins that are from other mints or distributors. They just sent out an email the other day about a new subscription for the Zodiac series, that series is actually from Belarus not Canada. Similar to the Fabulous 15 subscription, this series is assembled by a distributor in Germany, RCM sells is as a subscription only to Canadians.
Then you have the Superman series that wasn't as big of a winner as they'd hoped, started out as Canada only but when it wasn't selling out instantly they opened it up to US customers. Do you really want to buy something that failed to meet expectations in Canada though?