Try out this one from Flippa and this one from DNF.
It's in test mode and still needs some tweaking, but you get the general idea. The DNF one has just one example day, but I've had the Flippa one running for a few days to collect some data. This particular feed shows all sites listed in Flippa claiming $1000 pm or more. It comes in with each listing showing up as an individual post, but all posts for the day could be consolidated into one thread (as I've done manually here for the last few days).
Obviously there's been no fine tuning of listings, no weeding out etc. This is just the raw feed.
But would you like to see such feeds collected together here from multiple locations?