[trueluk]

A host family does not pay for its student's tuition. A host family will, in exchange for monetary compensation, provide a student with a bed to sleep in, meals, and a means for transportation to and from school and school activities.

However, Marek's use of the word volunteer - "I'm looking for volunteer host family in California for the next school year." - leads me to believe he doesn't want to pay the host family for room and board. We could clear up the confusion by emailing Marek.