There are some teachers in my school that will eat anything that's put out in the teacher's room. Usually the single male teachers Guess they aren't well fed.
My DD15 (a junior) has 8 teachers. We have gotten each of them $5.00 gift cards...except for two of them. They are her favorite teachers so we got them each $10.00 gift cards.
Just make sure your teacher is a coffee drinker. I am not and I always give away my Starbucks/Dunkin Donut gift cards. I really don't care for "consumable" gift cards. I am okay though with homemade goodies.
I decided on Barnes and Noble gift cards along with a little box of Godiva. I'm going in with another mom so we can give $40 for the teacher and $20 for the music teacher.
I still have my two dance teachers to give. Hmmmm.... thinking what to give them.