Like AU Tiger says, watch out for the local ticket scams.
On International Drive in Orlando, there are a number of shops selling discount tickets with strings attached. For example, some vendors want you to visit timeshares for a short presentation and thus be subjected to high-pressure sales tactics. Other vendors require purchase of a "coupon book" with the discounted tickets. In the end, this coupon book is literally worthless and the discounted tickets cost more than gate prices.
I've not visited Disney World since 2000. Even then, I obtained complementary tickets from my brother who got those from a friend. On other occasions, I used a military discount or just paid full price.
Discounts are definitely out there though. After a fellow co-worker searched the web last year, she found some valid hotel/ticket combo packages at very reasonable prices.