I believe Levenger gets their Circa line from Rollabind (
http://rollabind.com/
). Probably your best bet is to print your own Cornell notes pages and
spring for a specialty paper punch. If you have many students that
want to go this route they could chip in together and buy the notebook
making supplies in bulk (covers, rings, etc.). I've also seen a more
basic level Rollabind notebook at Staples (was in the $10-20 range).
-JJ