What happens if I don't pay my son's PUBLIC school fee?

My son is starting school in the fall, he's the first child of mine to go to school, and it's a public school. They request a long list of school supplies (including tissues and dry erase markers), going on the theory that everyone contributes to a general "pot" for all the children to "share" supplies - meaning none of them get their own belongings. On top of all that, there is a FEE of $95. I pay my taxes, and I have no idea what this fee is for. We are on food stamps, and Medicaid, totally in limbo right now, and I am unemployed over a year now, just ran out of benefits. I can't afford the $95... but they can't do anything ...right? It's PUBLIC school?? I'm worried about my son getting an education.