I taught first grade for 4 years before I had kids. I love putting together gifts for their teachers, here are my ideas beyond a gift card (but I so usually also add a gift card to their gifts)
Sections
1
Back to School
Back to School
My favorite pens!
Paper Mate 32ct Flair Felt Pens 0.7mm Medium Tip Assorted Colors: School Supplies, Stationery, Durable, Fade-Resistant, Art Set
Teachers use a ton of post its! These ones are fun!
Post-it 2.3"x3.4" Class Notes Pencil Lined Bright Ideas
And added a Starbucks gift card! I give back to school gifts at meet the teacher night so they can grab a coffee on the way to the first day of school!