Not unique. I am so sorry for what you are going through with your son.
I worked many years in prison. In my state (and I believe in most correctional settings) basic toiletries required for health and hygiene (shampoo, soap, deodorant, toothbrush, toothpaste, etc.) are provided free as are shoes and clothes. Incarcerated people are dependents and what they need to sustain themselves is provided to them. Money on his books, especially if he is mentally ill and vulnerable, can make him a target for victimization.
