Disney park passes for three days for under $150, including room stay and children free?
Sounds unreal to me, but you don't give us much detail. Which hotel is it? Are the children staying free? Because in that case that is not odd at all, but free passes for up to three children sounds outlandish to me.
Many budget sites charge a little over $35/night, and children stay free. Many members of the board do not recommend them because they are normally dirty, unsafe and overall problematic.
Similar offers may be easy to find on your own, but it all depends on where you are staying and what that price you quoted includes.
Wanda