I did a op's warehouse cleanout a while back. Deal was one price take everything. Woodrails, wedgeheads, bingos, and SS machines. Was in the range of 100 games all together. I averaged $100 per machine, but those $100 Bingos were balanced out by other desireable titles like Flipper Cowboy and Gold Strike. The deal totally depends on what is in the package.
But really, avoid the bingos at all cost. I had a hard time getting them sold. Even had a couple of OK feature machines like Silver Sails. Still didn't help much. And as far as weight goes, I think bingos weigh at least twice as much as a regular machine. You will not be moving those things without help or you'll have a third nut. I used up all my favors trying to get that deal pulled off.