Primarily at Michaels, a chain of craft stores. The one in San Luis Obispo has a larger selection. But the Templeton location is more accessible.

We also have a neighbor on the next road up who knows I make jewelry (this is the same woman who still hasn't gotten around to having me make those windchimes she commissioned me to make). And she finds beads and other supplies, and leaves them in our mailbox for me. The last set was something I knew I couldn't use, which occasionally happens. But I've gotten some cool stuff that way.