Seems Calgary Transit has very quietly raised their rates in the last couple of days. So quietly that their website still shows last year's rates.
http://www.calgarytransit.com/html/fares.html
So if you take the bus- expect to pay $2.50 today instead of $2.25. Also a pack of tickets will now set you back $21. However I did use one of the tickets I bought last month without issue.