Just returned from a trip to Quebec and used a company called
Similicious. $44 CAD for 2GB, $35 for 1GB (they also offer 5GB for $55) of 4G LTE / 3G data (although I was only able to ever get 3G, even in downtown Montreal, but I didn't piddle with the cellular settings at all).
They will deliver in Canada, to your hotel or residential address, for free, shipping to the US is only $2 (versus the ridiculous $8 that iPhoneTrip charges [plus IPT, I believe, does not yet offer LTE]). The SIM card was branded as
Bell.
All in all, was happy with the product ... they shipped with little metal tool that helped to pry open the sim slot (iPhone 5) which ended up being a lifesaver. Professional packing, service, and web site.