Here's another source, they include a national map of all retail biodiesel locations:
www.biodiesel.org
As you'll learn, it's a little tricky to make your own biodiesel, but plenty of people are doing it in garages and backyards. But as Jimmy Joe points out, you can run the 123 series cars on straight waste veggy oil gathered from restaurants. This is the raw material you would use to make biodiesel anyway, but running it straight saves you a lot of trouble. The 123 cars are considered among the easiest to convert to straight veggy. In your climate, you'll need some sort of system to heat the veggy oil in the winter, because it may thicken up in cold temps, but that's about it. These sites offer more info on this:
http://www.greasel.com
http://danalinscott.netfirms.com/