When it comes to any good AppleScript book they are all out of print. But all of them can be purchased on line in electronic form which means they are searchable and available for purchase.
I would have also mentioned "AppleScript 123" in this list but you already have that one. Just click the book title below and it will take you right to the web page were they are sold.
Learn AppleScript:The Comprehensive Guide to Scripting and Automation on Mac OS X (2010)
by Sanderson, H., Rosenthal, H., Piper, I., Wainwright, B., Levy, E., Monihart, H., Williams, C., Stanley, S.
AppleScript: Developer Reference (2010)
By Mark Conway Munro
"AppleScript 123" came out in 2009. It is a good book that is written in an easy to read format. "Learn AppleScript" is also an easy to read book. These are the 2 books I use as reference to look up AppleScript stuff in.
What sets these 3 books apart from other good books on AppleScript is they are the most recent good books on AppleScript. Some AppleScript books were great books in their time, but are just to out of date now to be of much help now.
All 3 of these books come in a pdf format that is fully searchable from Apple Preview and Adobe's pdf reader. When new to AppleScript being able to search a book electronically is very helpful. Also all 3 of these have sample code that can be downloaded. This is true even if you have an old paper version of AppleScript 123.
When someone is new to AppleScript sources of learning that have sample code are usually the best. Not only can you see how to do something, but you see different ways to do the same thing and that can really help later on when you start writing lots of scripts.