Pony wanted

Looking for a good kids pony.
We are a homeschool family, so we do have time to spend with our horses.
We have 3 acres & a large shed for our horses.
We currently have one gelding, and a miniature.
Needs to be good for a beginner - we're looking for a pony for my 5 year old sister, who is wanting to learn the ropes of owning, riding & caring for a pony.
The most the pony would be doing is occasional trail rides, and more often, bareback rides around our pasture.
We only have about 300.00 to spend.
Age: Any age is fine Height: Under 13.3hh
Breed: Doesn't matter
Color: Doesn't matter
Gender: Hoping for a gelding
Please contact me if you think you have anything worth us looking at!
We're in SC