I got mine at Argyle in Edmonton, Riverside was out but said they could order it in. I'd call your closest sled dealer and most likely they can get it in for you if they do not have it in already. Apart from that google it and you can order it online.
I am getting one and have been sleddin for over 30 years. Heard nothing but good stuff on riding technique on the dvd. Good to share with your up and coming riders as all they relate to is the dvd's made on extreme riding... basically don't try this