Here are general World Series odds including A’s and Giants courtesy of Bovada:

Odds to win the 2012 World Series

Cincinnati Reds                         5/1

New York Yankees                    5/1

Washington Nationals                5/1

Detroit Tigers                             6/1

Texas Rangers                          7/1

Oakland Athletics                      15/2

San Francisco Giants                 15/2

Atlanta Braves                           12/1

Baltimore Orioles                       15/1

St. Louis Cardinals                     15/1