At my school, lunches are about 80 euros per month - but I live out of the commune, so for locals they would slightly cheaper. That includes Wednesdays - as it is a half day but dd stays in the garderie. This is of course optional. You can take a packed lunch or go home for lunch.
The schools are generally open 7.30 to 6 or 6.30. It costs about 2 euros per day on average for the garderie. I pay about 40 euros per month then for after school care to include Wednesday afternoons and lunchtime supervision, and this includes a 45 min home work session 3 afternoons for Primary age. I usually collect her about 5 - 5.15. Again this is optional - depends on whether you work or not.
September is pricey. You get 150 euros CB instead of 100 to "cover" the extra costs. You basically pay for everything - pens, pencils, scissors, glue, paint, dictionaries, books, folders, decent school bag as they have to lug stuff about. This is in the French system mind - the Dutch system funds a lot more. Obviously stuff can be reused year to year - folders etc, and the list tends to get a bit shorter the older they get. The school will provide a list.
When school starts you usually get a list of things that will have to be paid for - 1 or 2 course books, swimming - about 50 euros a year, class fund which is 10 euros at my school. Extra curricular activities ie dd does a dance class at lunchtime which is 50 euros for the year. PE kit with school logo. They have various trips and animations though the year - probably another 50 euros worth. Less cost overall in Maternelle for everything.
Then in 3rd Primary you get classes de mer/classes verts - they go on a week long trip somewhere - costs about 150 - 200 euros. In 6th Primary they go skiing for 10 days/2 weeks - costs about 500 euros. These are part of the curriculum so everyone goes. The school usually lets you save up monthly over years.
On the upside - no uniform required.