Here is some stuff from Ebay http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=4161&item=6161509180&rd=1&ssPageName=WDVW http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=4161&item=6121500362&rd=1&ssPageName=WD1V http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=4161&item=6160665987&rd=1&ssPageName=WDVW http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=4161&item=6160698011&rd=1&ssPageName=WDVW There are tons more. just do a search for "bell bottom pattern".
i also have some old school patterns from the 60 's and 70 's i say go to a thrift store .. maybe u will find some old patterns there...
I have made my own bell bottom patterns in the past and I wasn't too difficult. I taped together some paper and drew out the patten according to my taste. When I first started, I looked at other pants patters to get and idea of size for the waise and rise. They all turned out pretty well!