Go to both the Orlando Visitor's and Kissimmee Visitor's we sites and request their packages. Orlando sends you a "Magic Card" which has a bunch of discounts. I used the discount for the Fairfield at Marriott Village, near I-4 and 535. It was about $55/night for a very nice room, with free WiFi and a large breakfast buffet (mostly cold items and make your own waffles). Hard to beat that price, location, and amenities.
Portie