Prices just went up, as they typically do for the summer. The special offer they had starting Jan 1 is no longer valid, it ended right before Memorial Day. AAA and Costco are your best bet, here's the prices Disneyland is selling at (to give you an idea of the saving using AAA or Costco):
http://disneyland.disney.go.com/tickets/
And don't buy tix on ebay or Craigslist, as another mama said, Disneyland has a way to catch them and will not honor them, this just happened Saturday to friends who came out from Arkansas, and they had to buy new tickets and are out for the ones they'd already bought.