I like Yahoo Finance option chains. I know from trading a thinly traded option that their data is updated witihin 5 minutes of the trade and very accurate. There has been a few times were a chain is still displaying the previous days data but that is rare and you will notice it.
Here you go http://www.theocc.com/market/series/series_search_form.jsp Conflicts: they will post conflicting codes if exchanges have conflicting code their nightly file they send to the occ. just filter those out and keep in mind the occ will only update the following night very rarely do they update the online site intra day.