Might there be a way to offer the US Roaming packages in a usage based format ? PM could charge a little extra, but then make it so it rolls over just like Canada long distance or Data Addon.
Business Case: I travel to USA, sometimes for one day, some times longer, but the 10 day block of time is wasted money if purchased but only one day is used. If I go to the US again in a month, I have to buy another block of time.
In lieu of this rolll over type plan, offer a daily plan (suggested by others) much like Roam Mobility. https://roammobility.com/plans