Telus has one for around 59.99 at Future shop! You get a 50$ card with a phone register online and then just add free evenings and weekends for30$ or free incoming and after 6/weekends for 40$ a month!
If you really want to just get a sim card then Robbers is your only choice, $20 for the sim I believe. However as Pilotas says 7/11 is the best deal, you can sell their phone or even if you throw it away you'll save in the long run thanks to longer expiry and cheaper airtime. Petro Canada is almost a good a deal. Those are the only pay as you go that use sim cards.