I reckon we's found ourselves a good deal here.
Price Club/CostCo.: If you belong to the Stanford Credit Union, you are eligible to join this "membership only" warehouse. You have to buy in massive quantities, so you might want to join with a few friends. Price Club is located in Redwood City on Middlefield, while Cost Co. is in Mountain View at the very end of Rengstorff, near 101.
San Antonio Shopping Center: There's a Target, Walmart, Sears, Ross, Tower Records, Mervyn's, RiteAid, and yet another Safeway all within reach in Mountain View. By bus, catch the 22 from El Camino and Stanford Avenue, next to the bank.