Are you looking for single park tickets or park hoppers? How many days do you need? Try looking at Mousesavers.com to see what current deals they have listed. Way.com is popular here, too. Check AAA (if you have membership), Costco, your credit union, etc. Military discounts are good if you are active or retired or will be with someone who is.
Do a search on the main Disneyland board! I found a place I bought discounted tix for and was very happy. Saved quite a bit off 5 day park hoppers for my hubby and myself.