Here are a few that are in similar ranges:
http://marketplace.sitepoint.com/auctions/34096
http://marketplace.sitepoint.com/auctions/34080
Having tracked the marketplace for the last few months there are a fairly regular stream of companies that have $10-15k in revenue.
They tend to be forums and have a very webmaster skew. So I am not sure there would be software buyers but it's worth a shot.
This forum was recently sold on sitepoint i believe too: http://v7n.com/