[Motel75]

An update seven years later: The Speakout offer is more or less unchanged, but it is possible to top up using a foreign credit card - at least if your bank makes you go through an additional confirmation step like approving the transaction in an app. I put down my hotel as my address but was able to top up 25 dollars with a German card, thus prolonging validity by 365 days. Another, perhaps safer, option, is to buy a top-up when you leave Canada. The codes are themselves valid for one year, so you can save it till you need it. Still no roaming outside Canada, though, so you will need to set up an online account before you go (or call customer service).