Free Chips And Medium Drink With The Purchase Of A Sub. 2020 Firehouse Subs. This offer valid with coupon at participating restaurants. Prices and participation may vary, see restaurant for details. Limit one per customer, per visit. Not valid with any other offers. Substitutions or additions may result in additional charges.Offer Valid at Firehouse Subs Escondido880 W Valley Pkwy Escondido CA 92025Exp. 04/10/2020. COMBO$SUB