I purchased a Mamiya 6MF, all of the lenses (complete with nice B&W glass filters!) and the panoramic adapter all in excellent condition from Calumet Photo in Chicago for $1500 in 2010. It was an awesome deal, probably the best camera purchase I've ever made.
I picked up a second Mamiya 6 body last summer from Map Camera, for around $400, which was also in very good condition... I'd been looking for a good deal on a second body for a long time, during 2011 and early 2012 the prices seemed to peak. (Adorama and B&H were both selling bodies for $1200!) But I think the prices are becoming better again.