I found this coupon over at ArizonaSavings.Blogspot.com -- she is amazing! She also shows you a really great Betty Crocker catalina deal to get 10 cent overage for fruit snacks :)
This coupon link is for a PDF for .55 any one half gallon or gallon of milk that is "Real CA" milk. I've only seen her use these at Safeway on Lucerne so they are probably the only ones that carry this kind. The coupon does not expire until... wait for it... JAN of 2011!
Hooray for cheap milk!