and there is a 50% off code that is working for July 4th - july450
which makes it $16 for the early-edition PDF-only version
(or $20+$5 shipping for dead-tree version but it's $25 on amazon anyway)
If I learn just one new trick for $16 it's probably worth it.
A few days ago I got an update from Manning:
"What's new?
Chapter 2, "Testing and Debugging" has been added.
Chapter 3, "Functions are fundamental" has been revised.
What's next?
Our next update will be coming quickly, with revised versions of Chapter 4 on closures and Chapter 5 on object-orientation with prototypes.