3 year old PreK program.

Our daughter’s school district offers a 3 year old preschool program it’s 3 days a week 9:15-12:15, $92 a week( $368 a month). My husband says it’s a waste that she won’t even be there long for almost $400 a month. I don’t really know anything about tuition PreK because our old district didn’t offer it. But is that about normal? I really do want her to start getting used to the idea of school so the transition from staying home with me 24/7 to full time PreK won’t be so drastic.