Sorry, but Disney is not like a lot of local theme parks that have discounts at grocery stores or things like that. Disney keeps a very tight hold on their tickets. You can find some very slight discounts at their authorized dealers, such as AAA, http://www.mapleleaftickets.com or http://www.undercovertourist.comIf you are looking at one-day tickets, there are virtually no discounts, other than occasional time-share scams.
Do you know anyone in Orlando? Anyone? If you can find a cast member, (there are over 40,000 of them) you can ask them to get you into the park on their employee pass. This is free! It is a one day ALL PARKS pass. Cast members also get other free tickets each year. They are not supposed to sell these BUT will sometimes let you have them for less than you would pay at the gate. Network like crazy and you will probably turn up these folks.
Try AAA, I am a member and they seem to have the best prices. Here are some links to Christmas at Disney.
I Searched on this site and got the Cheapest tickets,Check it out,it also had Discount Coupon Codes for Expedia,Travelocity, Orbitz,Priceline,etc.http://freetravel4ever.blogspot.com
If you know someone who works for Disney, they can get you and three other people in for free at any park. It does not include water parks though.