Ok ok I'll let the secret out for you canadians...

Buy your heat tape from beanfarm. Just google it, I forget the site. For me in Ontario I get it after shipping and everything about $2.75 per foot for the 3" stuff.

They are amazing to deal with as well. The best customer service ever. They also sell thermostats but all you need is a dimmer. You can get a complete dimmer kit from Canadian tire for like $8.