There have been lots of threads recently about parents who can’t afford to give the rebbeim/moros Chanukah gifts. As a Morah I totally understand and would never want a parent to spend more than they have. One idea though that doesn’t cost a penny but goes a long way-email your child’s teacher thanking them (be specific about what!) and cc the principal, director, administrator etc on the email. If a more yeshivish school and the individual teachers don’t have email then just email the administration. When bosses hear about their employees doing well it benefits everyone. When it comes time to renewing a contract etc the admin having positive feedback about teachers (or any other support staff you might be thankful for!) really goes a long way. Free and easy way to show hakaras hatov