If you pre-order the new book over at the Amazon.com, you get a free $5 certificate for the month of August! I do the Amazon Prime so I get free two-day shipping, and there's no tax, so it's a pretty good deal for me.
I'm a casual HP fan. Read all of the books once, each one was good enough to warrant reading the next. Watched the first fifteen minutes of the first movie and decided that it was bollocks.