I am in Los Angeles, and there are maybe one or two on each lot. I am looking to just purchase off lot, not too concerned about color, or exact features - but with only a handful in all of Southern Ca, even that is hard.
Check the buick website to search inventory. Or, try local dealer websites. If you want to wait until inventory picks up at the dealerships - you might want to wait for the 2009 model year. I don't think that will happen with the 08's.