I really liked the Scharffenberger plant in SFBA until it got bought by Hershey and production moved elsewhere. It was at the sweet spot (heh) of quality ingredients, scale (prices at $3 or so, and decent variety, but with small batches), and aesthetics. Really small scale production doesn't add much beyond that point.
Currently, I just get Trader Joe's (Villars or Valrhona). Especially at the $2-3 price point.