w. island

For Yogurt (not sour milk)

Culture: Healthy Tree ( West island),
http://www.healthtree.ca/contact.html
sometimes in Super C as well.

Cost: 6 bags, each for 1 liter, about $ 3-4

The best would be the culture by Donna Gates( author of body ecology),

but you have to order from US and to a US address, they do not ship to Canada.