i just sold mine last month for $450 in nice shape with the shotguns... didn't have to try to hard as someone on the SMAC list picked it up pretty quickly. i suspect i could've sold it on CL for about the same price.
that being said, the local TILT! arcades are trying to dump these and i picked up another one (working!) for $195, as did another local collector. no shotguns but i've got a line on a place to put this on location.