S.T.
I always prefer gift cards that are actually for something like a movie. In the days of video rentals I used to give Blockbuster gift cards with a box of microwave popcorn. Think along those lines - Dunkin Donuts, a favorite bakery in town. You can give different amounts too. Most of the time teachers & helpers don't compare wht gifts they got. $5 Dunkin Donuts to helpers allows for more to the teachers. If you're a Costco member you can get discount movie tickets there that you could give to the teachers...
The teacher-gift thing gets better as they get older. Now that my kids are in middle & high school we don't give any teacher gifts.