Live minnows in the Tri-Valley

Does anyone know if there are any places that you can purchase live minnows in the Tri-Valley or Walnut Creek area?

If it's not too far out of the way:

Castro Valley Sportsmen's Center
3794 Castro Valley Boulevard,
Castro Valley, CA 94546
(510) 537-8191

Always good to call first to make sure they have what you need.