Hep A Vaccination for elementary school children

I’m looking for places that have affordable Hep A vaccinations for children. The school district gave us a list but most of those places don’t have it or don’t vaccinate children under 14. HEB has them but at $90 a piece it was too expensive for the parents

I’ve 2 kids 6 and 11 who need this before they can start school. Preferably walk in, I’m in the northeast by Atascocita