I have had a ZWO 120MM for 2 years and it's a great camera to use on a dobs for lunar and planetary (and solar with the appropriate filters and films). It's very good value. It can be ordered from Optics Central or directly from the ZWO website.
Another option would be the QHY 5II which is pretty equivalent to the ZWO.
(
http://www.modernastronomy.com/camer....html#QHY5L-II)
Cheers,
Eric