If you don’t stay at one of the Disney hotels the accommodations shouldn’t be too expensive. Look online for hotels/motels in Kissamee, Florida which is much cheaper and is close to all the Orlando attractions. (If you don’t want to rent a car, most of these hotels / motels have free shuttle services to the parks)
The theme parks are very expensive, but there are ways to find cheaper tickets as well.
1) Look on Ebay- People buy multiple day passes and do not end up using all of the days, so they try to sell the remaining days on ebay.
2) Some of the area hotels / motels sell discount tickets
3) a lot of the gift shops (the really cheap 5 t-shirts for $10 type) also have tickets that people sold to them for resale (see #1 ebay)