I have one - runs great and is one of the most fun machineguns I own. Going rate lately is about $5k-6k for just a gun and one drum & winder.
I have to disagree about them being cheap to shoot though. The problem is volume. You don't just shoot one drum...you shoot several. A 275rd drum lasts about 10 sec. So with only two drums, you're burning up more than $10 in ammo in less than a minute. I've never taken mine out and shot less than 1500rds. About $30-40 in ammo is gone within a few minutes. They are tremendous fun though, and if you keep them tuned up, they're pretty damned reliable until about 1500-2000rds without cleaning. There were some good vids of guys shooting 180's at www.gulfcoastarmory.com but I don't know if they are still there or not.