Here are a few websites that specialize in Disney deals:
Mouse saversMouse planetThe Mouse for lessDisOrlando Sentinal - for area coupon bookletFor cheap, cheap plane fares, take a look at
flyertalk. They will post deals. For a comparison airfare sites, try
Kayak. You can mess around with dates, times, stops, etc and kayak will show you what is available. Make certain you sign everyone up for a frequent flyer mileage program. Some airlines allow the FFMs to be good for a year (southwest, jetblue), three years (AA), forever (continental). Read the fine print on the FFM because even though AA is only good for three years, if you add any miles, the three years resets and starts again.
Good luck and have fun.