cs154 introduction to automata theory languages and computation

I'm selling
Introduction to Automata Theory, Languages, and Computation SECOND edition.
In very good condition, only have few highlights.
ASKING FOR $15

Same with
http://www.amazon.com/Introduction-Automata-Theory-Languages-Computation/dp/0201441241/ref=sr_1_1?ie=UTF8&s=textbooks-trade-in&qid=1308323549&sr=1-1

Third edition of this book is sometimes used for a textbook for cs154. They sometimes use a different book. (I think it depends on who the lecturer is.) Not sure what they will use for this summer. The webpage is not yet updated.

Last time, when I took CS154, I didn't have any difficulties using this second edition instead of third edition one.
Third edition is sold at $118 at amazon.

I'm asking for $15 for second edition. :)
GREAT PRICE FOR A REFERENCE BOOK