If your budget is around $50~/month, definitely look into Judo. Most clubs are around that price range.Judo's one of the cheapest martial arts to do because most of the clubs are regulated and are non-profit.
Check out which location works best for you and go try out a few clubs. Scroll down, you'll see all the clubs in B.C.
http://www.judobc.ca/files/2011/08/2...directory6.pdf