Sweet Maria's Coffee
1115 21st St
Oakland, CA 94607 USA
Their care in selecting and reviewing the green coffee they carry is perfect for beginners and dabblers like me. Start here. They not only carry coffee but also host a ton of information on-line, actively participate in their coffee mailing list, and generally try to form a community around good coffee from tree to cup.
If you're nearby, you can pick up during limited hours. Saves on shipping and lets you meet (quickly; they're really busy) some great people.
The prices seem good, and the quality is superb. I've only had their pre-roasted coffee once (at their 10th anniversary party), but it was excellent.
And yes, I'm drinking coffee from their beans as I write this. An Ethiopian Golocha. Wonderfully rich on the City/Full City border. I nailed this one…