I have 2 kids in high school and one in 5th grade. My 5th grader the whole school gets free lunch we don't even get those forms to fill out everyone just gets free lunch. But my 2 high schoolers i give them $5 a day. thats $25 a week per kid comes to a total of $200 a month in lunch money.
Only my oldest pays for lunch and its 2.75 a day. BUT, she only is allowed to get school lunch once a week at most bc that food is crap. She usually only wants it once every two weeks. So, most of the time she packs. Her packed lunches average to about 5-7 a day I would guess, depending on what she takes.
Dd takes her lunch. It is pretty much the same every day. Chicken tenders, apple slices, raisins, pretzel sticks, apple juice, and 2 chips a hoy cookies. (she uses part of this as a snack). I'm going to say it costs about $2 per lunch/snack
My sons take breakfast to school 6 days per week (they have breakfast-break after prayers every morning) - and they eat lunch at school 4 days per week. Their school offers a lunch on full-days for 5.50 NIS per lunch....so for the two of them it is 44 NIS per week (about $11) plus breakfasts from home.
DD#3 takes breakfast 6 days per week and lunch 4 days per week....they don't have a cafeteria, so they must all bring all of their meals.
DD#2 takes lunch two days per week - her days start later, so she eats breakfast at home every day. The other 4 days of the week she only goes part time....so she eats at home.