Tips for buying a White 2011 Prius in Northern CA at a reasonable price?

Update on my New Prius Purchase:
Thanks to everyone for their advice on purchasing. It seems that Prius prices in the bay area have come down dramatically in the past week. After waiting 3 months to purchase, I was able to purchase a new Prius Two for $23,600 which was $1100 under MSRP (approximately invoice price). I called a number of other dealers in the area and three of them were willing to match the price and several others just said it was a good price.

So for everyone out there frustrated with Prius pricing, the inventories have finally built up and dealers are discounting again. I'm sure it will continue to get much cheaper.

Happy to be another Prius owner!