ISO horse: diamond in the rough type - $500 (Woodbury, TN)

Kids riding program ISO horse.
Looking for the diamond in the rough type, skinny horse that needs weight, etc.
Requirements: Gelding Under 21 Sound at trot and able to canter a bit but prefers to walk around.
Safe for kids!!! -needs to be able to stand for farrier, no spook, bolt, rear, buck, pulling back, etc Budget up to $500.
Skinny, overgrown feet, etc is ok.
I can work with that.
Maybe someone out there just can’t care for an older horse and wants them to have some purpose in their golden years teaching kids to ride.
Please email with CURRENT pics, info, location and asking price