Where can you....
Where can you buy this movie?
Do they still sale it in the comics?
You can buy it here:
http://stuffshop.archiecomics.com/videos.html
Hope this helps. :)
from www.archiecomics.com
If you have the time, someone has actually uploaded the movie (in 10 separate parts) onto Youtube.
Just type "Archie: To Riverdale and Back Again", and you'll see part 1, part 2, etc...