Get registered to the AP part of
disneyland.com. They detail the discounts and special offers there. Through that site, for Yule, I was able to get the POTC3 2-disc set for the usual price, AND I got a special keepsake picture of the Asian ship, a coin, and a bit of the Asian ship's sail. It was a special they were offering APs at the park on the release date of POTC3 DVD, but ordering through DelivEars through the AP section got me the same deal.
Also you'll get a newsletter/magazine thing, I think it's once a quarter, and this last one there was a lovely $20 off $100 purchase coupon. Since I don't have the Premium which gives a discount on merchandise, it was VERY helpful!
If you're into pins, unless they run out, some restaurants offer a special pin for every $30 you spend there. We got cute ones at Blue Bayou for the Fall quarter, and looked forward to the Winter pins, but they were already out when we went in December.

And you have access to AP-only pins that you can buy at the parks.
Those are my AP tips.
