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Buy a Medium or Large Sub, Chips and Dessert and get a Medium Sub free with this Firehouse Subs coupon valid through April 19, 2020. CLICK HERE for your Firehouse Subs free medium sub coupon. Valid only for carryout orders only. Or, get a free Kids’ Combo with purchase of a medium or large sub with a Firehouse Subs coupon valid through April 30, 2020. CLICK HERE for your Firehouse Subs free Kids’ Combo coupon. Note that the deal is valid on carryout only, not delivery or online orders.