Class                   Title                                                        My Price                     Used/ New

Physics 21/23/25: (Physics by: Giancoli 6th)                          $100   Bookstore: $162.75/ $216.75
 
Chem 33/35/ 131: (Organic Chemistry: Vollhardt 5th)                 $62      bookstore: a lot more

Econ 1A:     (Economics 6th, by Taylor)                                $60     bookstore: $173.50/ 231.25
     (Not world crisis edition, but almost identical; you can check it out beforehand)

Chem 31A/B: (Chemistry Structure & Dynamics: Spencer)  $50     bookstore: $122.50/ 163.25

Stats 60/ Psych 10: (Basic Statistics for the Behavioral Sciences) $75  bookstore: $188