They are available. What you can do is this: Take the URL of the board you are interested in, e.g. Boston
http://www.hungryonion.org/c/regions/boston-northeast
To get the RSS feed, just change the URL by appending .rss at the end of the URL, i.e.
http://www.hungryonion.org/c/regions/boston-northeast.rss
Cheers.
