As a teacher, myself, you have no idea how much we appreciate even the little things! It makes us feel appreciated.
I know that I would love a GC to anywhere...to fill a treasure box, to get more pencils (as the mean ole pencil sharpener supposedly keeps eating all of mine ), to get incentives for the upcoming CRCT, etc. etc.
Your child's teacher is blessed to have caring, giving, and supportive parents like you!