They also have $6 Meatball Sub Combos as well. Includes a medium meatball sub, 22oz drink, & chips.
On Saturdays, the Firehouse Subs in my area have $0.99 kids meals with the purchase of an adult combo. YMMV.
Make sure to get the app to earn points for each visit that you can use towards free food. Get a free large drink w/ sub purchase for your first use. Free medium sub on your birthday.