Seems the earlier machines fetch more.
Would like to add a Bingo to my collection in the new year.
If you understand how they work, their not as boring as you think.

They were ahead of their time. The 50's Bally Bingo machines in original state are worth a lot more than these 70's machines. I would not pay more than $400 for a 70's Bingo. If you can locate a 50's bingo, then the asking price can be around the $1400 mark. I've restored a Bally Miami Beach (10 years ago) and they are HARD WORK to restore, but are fantastic to play.