I'm researching the same thing for a trip next July. I haven't found the absolute best deal yet - but I think some places don't have 2012 discount ticket rates yet (Sea World?) so I'm not convinced I've come up with the best prices yet.
I tried contacting my local AAA office and was told that they do NOT have discounted
Disneyland tickets available here (North Carolina) and additionally, she contacted someone in the SoCal AAA and they don't have them there, either. Apparently I can only get discounted AAA tickets if I book a package - which does me no good, since we're DVC members!

I pointed the agent to the Disneyland AAA ticket website I had found, with the information that their tickets are for purchase without a hotel, so who knows - maybe she just isn't a Disney Specialist or something.
aRes Travel has good prices. You can also get 3 day DL tickets with the SoCal
CityPass - which also includes 1 day at Universal and 1 day at Sea World San Diego. If you plan to hit those parks - or even just one of them - this ticket might make more sense.