Where can I buy lemon verbena in the Bay Area?

I love lemon verbena herbs, which I make into a tea…but it’s really hard to find it at the farmer’s market. I got a whole bunch of it that was in my friend’s CSA box and now I’ve used it up. Is there anywhere else I can buy it? I have access to a community garden so if anyone knows where it could buy a small plant of it, I could plant it in my garden. I checked the gardening center at Home Depot but they didn’t have it. Or, if there is a market where it is sold cut, I could dry it myself…