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Firehouse Subs is celebrating National Meatball Day today by offering their Meatball Subs for only $5 when ordering through their app or online! Their OG Firehouse Meatball was so popular (a top-5 most ordered item), they created 3 others for whatever your meatball mood – Chicken Parmesan Meatball, Sweet & Spicy Meatball, and Pepperoni Pizza Meatball. Offer valid March 9, 2024.