Three different options here in WA state:
AP classes -no cost to take the class. Appx. $100 to take the test, paid by the student. You are not required to take the test.
“College in the high school”-class taught at the high school, with college/community college credit available for a fee. The fee varies depending on which college if granting the credit, usually $250-300. Sometimes AP and CITHS courses are the same course and kids get to decide if they want the credit, and which one they want. School arranged for books and materials as they do for regular high school classes,
Running start -dual enrollment at the local community college. Tuition paid by the state. Books and fees paid by the student. If you choose your classes carefully from the concordance tables you can graduate from high school with your AA degree.
Bottom line, if you want the credit for college level classes you’ll be paying for something.