Just want to be sure i'm covering the question.
First, there is no difference if you by from a link or from the amazon.ca page directly, as long as this link refer to the actual amazon product sold by greenhouseprod and fullfilled by amazon. If not , that mean that somebody pirated the content and try to
sell it himself. Do you want to post this link here so i can confirm with you ?
On what Paul added, if you are in Canada and you buy from the amazon.com store, then you will have to pay for shipping and amazon.com may show you or not, but you will have to pay for custom duties. Most of the time it happens at your door step, the postman will not give you your package until he collect the tax ! Not to add that Canadian customs have a tendency at holding package for couple of weeks sometimes !
But if you buy on amazon.ca, then there is no tax obviously, and you are automatically qualify for free shipping. If you are prime member, that is even better and you will receive your DVDs in 2 days or less. Here is a direct link to the amazon.ca page :
http://www.amazon.ca/Wood-Burning-Stoves-2-0-Permaculture/dp/B00FBXAFQA