Hi, Rebekah! Three boys in Disney World sounds like a blast! When our kids were little, we often took our double stroller. When going on the monorail, you can simply roll your stroller right on without even removing your kids!
The busses are a bit more complicated because you do have to fold your stroller up prior to getting on the bus. Other than that, it really is no big deal to bring along your own stroller.
If you choose to rent a stroller, singles and doubles are available at each of the theme parks, water parks and Downtown Disney. The cost is $31 per day for the double. You only pay once for the entire day, so if you change parks, simply show your receipt for a new stroller. For more information on rental location and pricing, click
HERE.