Chime.
It is around RD$1,000 pesos which is like US$20 for a uniform set. That is 2 shirts, 2 socks, 2 trousers/skirts, one pair basic black shoes, one tracksuit pants, one airtex (is that american? ) shirt for sports and a backpack and pencil case with pencils and sharpener and rubber (eraser in American), plus 6 exercise books.
I don't know the price of the text books, one for each subject, but they only need them when they are at the pruebas nacionales stage which is older kids and many schools provide them free now.
We bought in bulk - like 80 sets, in a local store so we had a discount. Kids cannot go to school without a uniform so this meant 80 kids who were standing outside the windows of the school, looking in longingly, could now go. It was amazing.
Matilda