Go back to Subway when you go back to school this year and earn a free sandwich during the Subway Card Event. You'll get a free regular 6" sub when you buy $25 in Subway gift cards.
To qualify you must load or reload your $25 gift card in store and redeem your free sub at the same time. Double meat, extra cheese, and/or bacon will incur extra charges if you select them as toppings on your free sub.
There's a limit of one free sub per gift card purchase or reload. Check with your local Subway restaurant to see if they are participating, you can find your nearest location with their store locator.