I have a Mammut smart alpine belay device (http://www.backcountry.com/mammut-smart ... 9mm-10.5mm) That I got to play around with. I have used it 4-5 times and it is in pretty good shape with only mild use put on it.
If you are interested please reach out to me either a PM or email (chris@cwoodall.com). If you want to give it a try let me know