Gifts for coworkers and students when leaving a job?

Hey everyone, I just wanted to get some ideas on something I could do to say goodbye to my students. I’m going to give my coworkers cards and write notes to them and Ik those alone will make them happy, and probably get my boss/best friend a gift of some sort because I love him so much. But I have 6 students who are very near and dear to my heart and I’m on a budget. I was thinking maybe dollar tree gift bag goodies, and of course personal notes to them. I’m an aide in a high functioning autistic classroom and I’ve been with them for 3 years so they’re VERY close to me. Any cute budget friendly ideas??