I just paid $3K for mine. It has a super nice PF, brand new CRT monitor. Some decal crinkle by legs and needs new t-moulding. Shipping was discounted so it all averaged out. They seem to go for $2200-$3000 with some higher online. It seems to be a bit hard to find lately like all Williams games. Due to fun level and the recent price jump of AFM expect RFM to start climbing in price too.
Good luck as I had to hunt around for one and only a handful were posted.
Michael