I just learned that Hoflin Publishing Company recently went out of business and a lot of their old stock (books) was sold.
A lot of Dick Bueschel's books were published by these guys.
The couple that bought these books are now offering them for sale at very good prices.
Go to: http://www.arcade-museum.com/coin-slot-books/
Anything with an AMAZON link is something they have available.
There is one exception. . . .
The 2-volume, autographed, hardback edition of Bueschel's Jennings Slot Machines 1906-1990 is also for sale; but they will be available thru eBay.
They only have a hand-full of the hardback editions and I expect them to go fast.
These books have been "out of print" for several years. Here's a great opportunity to get some of the best information about coin-op machines available.
If you're new to coin-op collecting, any of Dick Bueschel's books are worth there weight in gold (IMHO).