There are a lot of Yoga studios provide Yoga Instructor training classes.
For cheap: KarmaTeachers
General: many Yoga studios
I heard that Dharma Yoga Vancouver, YYoga are good. But I didn't have chance to try it yet.
Ashtanga Yoga is a more traditional style practice (my style) :)
And Waylon Belding (ZUDDHA yoga) is really good, he visits Vancouver every year (
https://www.facebook.com/waylon.belding?fref=ts)
Not saying other Yoga studios are no good, just there are too many, I didn't have chance to try every one of it.