What is the money for? I'm just thinking of somebody selling something like a laptop on eBay.
I would try and find somewhere in Calgary that issues them to get it cashed.
Back when I dealt with money orders on eBay I used to only accept USPS Money Orders from the States; the only thing one is they do have one available at the post office that says "not cashable outside the United States", but some Americans would still send those to me.