When it comes to burgers, the topping options are endless. But, somehow, classic cheeseburgers are still holding strong against the competition. On Sept. 18, burger lovers will celebrate National Cheeseburger Day, and many restaurants are firing up the grill and giving customers some juicy deals to bite into. Ready to join in on the celebration? Here are a plethora of discounts and freebies to choose from. Dog Haus  Dog Haus will run a buy one, get one free cheeseburger offer for rewards members on Sept. 18. The offer is available in the chain’s app. Eddie Merlot’s On Sept. 18, Eddie Merlot’s customers can order Eddie’s Prime Cheeseburger for $15 between 4 — 6:30 p.m. Pricing and participation can vary based on location. Farm Burger Grass-fed burger chain Farm Burger is running a build-your-own cheeseburger deal starting at $5 on National Cheeseburger Day. Farmer Boys Farmer Boys customers can order the chain’s Big Cheese cheeseburger for just $4 on National Cheeseburger Day between 2 p.m. and close at participating locations while supplies last. The offer can’t be combined with other deals, is limited to two burgers per customer and is available in restaurant or in the drive-thru. Very Important Farmer (VIF) loyalty members can also get an extra surprise when they scan their receipt. Friendly’s Friendly’s Fan Club members can save $2 on cheeseburgers between Sept. 18 — 20. Hat Creek Hat Creek customers who order the Little Hat Burger in the chain’s app will score the menu item for just $2 on Sept. 18. Instacart Instacart customers can get $10 off their $20 purchase from the National Cheeseburger Day product collection, which features meat, cheese, buns, condiments and more. The offer is valid at select retailers via Instacart.  Krystal Krystal is currently running a limited-time offer for 12 cheese Krystals for just $15. McDonald’s McDonald’s customers who order in the chain’s app can enjoy a 50-cent double cheeseburger on Sept. 18. Omaha Steaks Omaha Steaks is offering the following deals in honor of National Cheeseburger Day: Perfect Burger Pack for $99.99 Custom Burger Experience With Free Brioche Buns for $129.99 Deluxe Burger Experience for $131.46 Butcher’s Burger Assortment for $188.46 Red Robin Between Sept. 17 — 19, Red Robin customers can get a Gourmet Cheeseburger, bottomless side and drink for just $10 (regularly $14.99 or more) while dining in at participating restaurants. Sonic For a limited time, Sonic customers can order a quarter pound double cheeseburger for just $1.99. Smashburger Smashburger customers can score $5 Classic Singles on National Cheeseburger Day in store, online and in the restaurant’s app using the code CLASSIC24. The offer includes Classic Singles, Classic Single Turkey Burgers and Classic Single Black Bean Burgers. Sullivan’s Steakhouse Between 3 — 6 p.m. on Sept. 18, Sullivan’s Steakhouse customers can order the restaurant’s signature beef burger sliders for just $10. Pricing and participation can vary by location. Wahlburgers Wahlburgers adult burgers will be 50% off on Sept. 18 at participating locations. The offer is valid in-store and online, and excludes doubles, triples, sandwiches and Smahlburgers. It’s limited to one per customer and can’t be combined with other offers. Wayback Burgers Wayback Burgers is running a buy one, get one free deal on its classic burgers on Sept. 18. Wendy’s Between Sept. 18 — 22, Wendy’s customers can get a Jr. Bacon Cheeseburger for $0.1 with any purchase while placing an app order at participating restaurants. Whataburger On National Cheeseburger Day, Whataburger rewards members who place an app or online order for a patty melt, Sweet & Spicy Bacon Burger or a Whataburger with cheese will be entered for the chance to win free Whataburger for a year. Winners will receive their prize in the form of 52 coupons, which can be redeemed at participating locations. White Castle White Castle is running a buy one cheese slider, get one free deal on National Cheeseburger Day. To score the deal, simply use the code SAYCHEESE in the restaurant’s app. In addition, customers can buy a sack of 10 cheese sliders for $7.99 ($8.99 in New York, New Jersey, Florida and Arizona) through November 10. This article first appeared on TODAY.com. Read more from TODAY here: The healthiest lunch for weight loss includes these 5 components, according to a dietitian Wendy’s is selling Jr. Bacon Cheeseburgers for 1 cent for 5 days McDonald’s is selling double cheeseburgers for 50 cents — but only for 1 day