UT's Canadian Exchange rate sucks worse than your credit card's exchange rate, BTW (last I checked, it worked out about 17%, despite what it shows on the site). And your credit card tacks on 2.5% - 3.5% on top of their handpicked (not good) exchange rate (~10% + 3.5% = 13.5%... I don't believe they pyramid them). Something to chew on if you aren't paying in US Funds.
Call your CC company and work it all out. Or do what I did. Working all that out was too frustrating so I just went to CAA and paid the extra ~$5 to get a ticket there. Came with that silly diamond parking pass, too, so I can stub toes with the handicapped spaces (they're not in as good a location as you'd think).
All that being said, I did email UT a couple of times with questions and they answered quickly, so I imagine they're good to deal with, but pricing might not be as awesome as it looks to Americans for people outside the US.
EDIT: Looks like UT doesn't offer other currencies anymore. Canadians buying there should do what they should do for all purchases in US$ on a CC. Convert at the current exchange rate and add ~4% to cover the not-so-great exchange rate credit card companies pick and their bonus fees.