Uc Davis Bookstore.
It is located in a convenient place. Some non-academic books are sold on the top floor along with souvenir (shirts, mugs, etc.). Textbooks are sold downstairs and they are organized by department.
UC Davis Bookstore.
Convenient location -- right next to the MU! A little pricey but nice to have everything in one place when supplying for school. We've also found some nice gift items for friends and relatives here.