Instruct: Classify a given review as either positive or negative.
Query: Feel ripped off. Newer edition available for $4 used.

I wish I would have researched this more before buying because I was trusting I was getting a good deal. I paid about $22 after shipping before I realized the newer edition from 2008 is only $9 new and $4 used on here. When I looked at the US price on the back of this one when I got it said $7.99 US. I really feel ripped off. I guess I should know better and do more research in the future. Otherwise the book itself is great.