There's something affirming and warm about going to local farmer's markets to purchase produce straight from people who grew it for cheaper than you can find in the supermarket. With all the markets all over the bay area (there are two per week in San Mateo alone) it makes for some great shopping and exploration.
The photo here is from the smaller one on Wednesdays. Even browsing an hour before closing sends you on a produce expedition. Start with staples, explore some outliers, and end up finding the weird and the beautiful.
Getting produce from farmer's markets has both cut costs and increased tastiness. You can make some really great pasta salad for no more than a couple bucks a pound.