
Disneyland is a unique place - and it has unique market conditions which apply to it that don't apply to other theme parks, including Southern California theme parks.
Disneyland doesn't have as many discount or special offers as other theme parks because most people are going to go to Disneyland whether the tickets are on sale or not. For this reason, there are relatively few discounts on Disneyland tickets. There are ways to save on Disneyland tickets, however.
There are discounts on Disneyland tickets, but these are for multi-day passes. There aren't any regular discounts or savings on single day passes - but as you buy more days, you'll see more savings on tickets. This includes tickets sold in the park and also through ticket partners and neighboring hotels.
For regular Disneyland ticket pricing, you can check out the Tickets section at Disneyland.Com. Remember, you'll almost always be better off purchasing the tickets online than standing in line at the park (sometimes the ticket stands can have up to an hour wait!).
Some travel agencies such as ARES Travel have discounts on tickets, but we're talking just a couple dollars, and for the costs of having them delivered, they currently are no better than buying them directly from Disneyland.
Occasionally, Costco will have some Disneyland specials. Currently they have a deal on tickets for SOUTHERN CALIFORNIA RESIDENTS ONLY of $129 for 4 days.
If you're looking for a deal on a day or two only, check out eBay and craigslist. If you search craigslist in Orange County, LA or San Diego, you can find partially used hopper passes, and you can also find some good deals to SeaWorld, Universal Studios, Legoland and Knotts.