The book is nice to have, but not a must have: the design is good, the pictures are showy, the text on the natural history of the "tipitiwitched" is the best part. Of course a book on just a single species with over 440 pages can become a bit lengthy. The how to grow part is similar to most other CP books, the cultivars chapter takes up a lot of room and is in parts repetitive. Since 2012 many more cultivars popped up, so it is certainly not up to date. It is still on sale in the UK for 30 GBP (www.nhbs.com/dionaea-the-venuss-flytrap-book).
It is a remake of the older book of Bailey from 2008 with 279 pages (Trafford Pub., Victoria, BC) where most of the historic texts were already presented.
Just look here for more up to date lists and pics: ICPN for registered cultivars & cpphotofinder for all kind of names.
There is still a lot of VFT breeding and selling going on and people keep inventing names without registering.