Winter driving school to work on car control?

[BartMW]

I'm wondering if anyone knows of any winter driving schools where you can get some drifting/car control instruction that would translate to the track? I've done some skidpad exercises at Mont Tremblant which helped a ton and was figuring that a winter school might be a good place to explore the limits of the car without as much risk of breaking it. I'm in Canada between Montreal and Toronto.