Free small sub with purchase of a medium or large sub, chips and drink. 2019 Firehouse Subs. This offer valid with coupon participating restaurants. Prices and participation may vary, see restaurant for details. Limit one per customer, per visit. Not valid with any other offers. This offer valid with coupon at restaurant located at 9903-C S. Military Trail only.Exp. 7/3/20. SUB$SUBDRINKCHIP