Transport Canada has added a list of approved ELTs to their website.
http://www.tc.gc.ca/CivilAviation/certification/elt.htm
Keep in mind though, ELTs that are certified to Airworthyness Standard TSO-C91a will not longer be valid as Transport Canada has mandated that ELTs transmit on 406Mhz. I’m unsure when that requirement takes effect.
CAR 605.38 has more details.
