If you are a W-2 employee, then none of your job related expenses are deductible. If you are classified as a "teacher" then "some" expenses are deductible. In other words, are you an "eligible educator"?
An eligible educator can deduct up to $250 of any unreimbursed business expenses for classroom materials, such as books, supplies, computers including related software and services or other equipment that the eligible educator uses in the classroom. Supplies for courses on health and physical education qualify only if they are related to athletics.