Hello BJ the El Cortez $40 Bell is listed in Bill Cohenour's book at $180 - $250 but the only ones sold on auction brought $59-$80. The reason for the wide spread is that the $40 strikes were discontinued by IGT and I don't think any have been sold since that happen. The Plaza twin towers is listed at $140 - $180 and the 2004/05 auction prices range from $84 - $132. The Palace Station BR is a common at $12 - $18.