Prices according to the 2005 Mr. Pinball Price List
(for a very good condition)
Pinbot: $925
The Machine: Bride of Pinbot: $ 1,275
Back to the Future $1,075
The Simpsons (not Pinball Party) $ 1,425
Addams Family (not Gold edition) $ 2,825
As far as maintenance: there is a lot of cleaning and minor stuff (light bulbs, etc.) at first, but after that they're pretty easy to keep running.
There are some great guides online for troubleshooting, and I've only had to call a "pinball tech" twice for board repair (both simple fixes, I just didn't realize it at the time!)
More pinball repair info than you can ever possibly use:
http://marvin3m.com/fix.htmI'm currently shopping around for pin #3, but negotiations with the wife have hit a few snags (and bills
)
Kevin