I'm currently working on a film that has a few prison scenes and my prison contact may not be able to get me in to a proper facility to record my own stuff in time, so I'm sending up a flare here.
I don't have a bunch of heavy intense needs. Really just a modern prison buzzer or two and a few automated door opens and closes. Also, any authentic prison yard weightlifting or mess hall ambiances would be useful, though we have loop group coming in to cover much of that.
I have a large personal library of sounds available to trade, so hit me up: rene [at] dallasaudipost.com and we'll see if we can get something worked out.