What did a gallon of milk cost in Ca in June 2009?

I have seen it anywhere between $2.55 a gal at Walmart to over $4 at small markets and quick stop places. At Costco it is just over $2.60. It has been fairly consistent for the last 6-8 mos.

If California would allow farmers to capture methane for farm use it would help keep Milk Prices at a reasonable level. If milk trucks could collect milk and methane fuel when they picked up milk and transported milk and milk products this would keep transportation costs down and would only benefit our economy and environment.