Hi! My three kids are between 5-9, so I feel your hotel pain!! LOL!!!
Try hotelkingdom.com for a few suites in the area you are looking for (WDW or US) that are in your price range. Then come back here and look for posts from people who've stayed there, or post a question with your list of hotels.
For our August trip, I'm debating Sierra Suites, HoJo and Comfort Suites, all in the US area and all below $60 a night. It's worth the extra couple bucks to get a suite so you can do some light meals and save dining out expenses.
Patti