S.A.
I always give the teacher a $20 gift card to a book store (So they can get something for them selves or more book for there class room if they want), and some $5 flowers from wallmart. My sons second grade teacher was a man so he didn't get the flowers, but a little potted plant instead. Also each teacher got a little thank you note from me. Its had work and some times a simple thank you gos a really long way