I did a google search for it originally. There is a guy in Vancouver or Calgary, can't remember exactly where he is right now, but this is his website: http://www.cornelsworld.com/
I bought some heat tape from him before. He was good to deal with. I now order my heat tape and other accessories in the States (Reptile Basics) and pick them up at a border store. It works out to be a bit cheaper for me. (good dollar exchange rate right now too...lol)