<p>Different publishers. I bought my book for $18+s/h and it shipped from Berkeley, CA. I'm pretty sure both books are exactly the same since I have the latter print, and the text reads that the book was designed for MIT's EECS class. </p>
<p>Point in case: Both books are the same. Buy the cheaper one if you want a printed copy.</p>
<p>They are the same book from my friends' experience. Use the cheaper one to save money. I didn't know that until I bought all the textbooks NEW at the Cal Student Store, which cost me a lot of $$$.</p>