Hi Kimberly!
A great option for larger families visiting Walt Disney World are the Family Suites at
All Star Music Resort. These rooms are moderately priced and offer accommodations for up to 6 people per room. Depending on the time of year you're planning on visiting, these are often priced at less than $200 per night. Another great option is to consider two regular, adjoining rooms at a value resort such as All Star Music, All Star Movies, All Star Sports or Pop Century.
Also, its a great idea to keep an eye on the
Special Offers page of DisneyWorld.com. There you'll find any discounts or promotions which may save you a bundle on your trip!
If you're planning ahead for a summer (or later) 2012 trip, Disney is also in the construction phase of a new resort:
The Art of Animation Resort which will also feature family suites.
Hope you have fun planning your trip! Be sure to let us know if we can help with some more details!