Hard to remember, as my son has just finished his first year and we paid those fees in the summer. I wrote one check for, I believe, an activities fee. It was around $160? I think the other two checks were not required. One was for lunches/milk. Not knowing whether he would eat school lunches or want a packed lunch I only wrote a check for $20. The third was to the PTO. They had clothing from the previous school year for sale and were taking orders for the student address/phone book.
It really does vary from school to school, but very few schools are able to get away with charging nothing. I think our school district is in pretty good shape. The school supply list wasn't too long, and it seemed as if all of the items would actually be used in his classroom. One of my co-workers lives in a different district, and the supply list their included items for the office and reams of paper. Not always easy for schools to operate with current budgets.
How exciting for your son! I hope he has a great year.