I would also suggest Mouse Savers not only to Disney World but other Orlando attractions.
I just took my grand kids to Lego Land and got a buy one adult ticket and get a kids ticket free. Great place for kids 5 to 12. They have 4 roller coasters and rode all of them at least 3 times each. Lines were very short last Friday. Many times we got off a ride and got back on it in minutes. The roller coasters are good for the 5 to 12 age range and the 55 and over group. Many other rides other than roller coasters.
Mouse Savers link below. A great website.
MouseSavers.com - Your source for Disney discounts, codes & deals!