Cormen et al., Introduction to Algorithms.
It's of course in the campus bookstore; I haven't checked the price, but I'm guessing it's in the high 60s or the 70s.
Also, it's available from Varsity Books, where it's $55.25 for the book, and $5.00 for UPS Ground shipping. (They claim that if you get your order in before 12:30 p.m. Wednesday afternoon, you'll get the book on Thursday.) The identical book is published by both MIT Press and McGraw-Hill; at this web site be sure to pick the MIT Press choice, since the McGraw-Hill choice costs five or ten bucks more.
(At Amazon.com last I checked it was more.)
The book has a list of errata that runs 27 pages; I will give you the pages that cover the chunk of the book that I expect we'll cover and put a link to the entire list of errata in Postscript on the Web.