I got one from that group buy but unfortunately mine leaked after about a month of being installed. I just think that it was a faulty one and was just my luck. I went back to the regular one. Hey I got ample mileage out of the first one plus at the time I didn't have a choice if I wanted my car back.
I have heard people saying that they are hard to find in Canada but they are there. You just have to keep looking. Try places in Quebec as well.