I have been wondering the same thing. Jostens(dot)com is currently where everyone goes for them. I no longer see the option for "James Madison" but do see one for "Ashworth College". However, if you select "Homeschool" you can customize it to say "James Madison". I plan on doing that when i graduate. I don't know why they don't have James Madison already listed, as they did before.
**Update: Looks like Ashworth College doesn't have their class ring listed. So i am assuming it all would have to be done by making it customized yourself through the homeschool option or calling Ashworth to discuss it and order through them if they are able to do so.