Is there a good place to buy reasonably priced teas?

I just bought Tonia George’s “Tea Cookbook” and am wondering if anyone could recommend a place that sells quality teas that aren’t too expensive in the Bay area. I live in Emeryville and wouldn’t mind trekking into San Francisco for a great shop.

I’m specifically looking for sencha and chinese gunpowder green tea, matcha, and lapsoung souchong.

These are the types of teas the book calls for: assam, bancha, darjeeling, dragonwell, earl grey, gunpowder, gyokuro, honeybush keemum, lapsang souchong, lemon verbena, masas chai, matcha, orange pekoe, peppermint, roibos, rosehip, sencha, yunnan.

Thanks in advance!