When it comes to burgers, the toppings are endless. But somehow, classic cheeseburgers still hold their own against the competition.

On September 18th, burger lovers celebrate National Cheeseburger Day, and many restaurants fire up the grill and give customers juicy deals to bite into. Ready to join in the celebration? Here are a plethora of discounts and freebies to choose from.

&pizza

On September 18, &pizza is selling its Sun’s Out Buns Out pizza all day for $5 (regularly $13.99). The pizza features the chain’s parm romano sauce, mozzarella, hamburger patty, onions, cherry tomatoes, lettuce, pickles and burger sauce.

Applebees

Applebee’s customers can get one of three burgers and fries for just $8.99 on September 18 at participating locations: Classic Bacon Cheeseburger, Classic Cheeseburger and Classic Burger. The offer is valid for dine-in and to-go orders.

Bad Daddies

Bad Daddy’s customers can order the chain’s All-American Burger with cheese for just $8 on September 18.

Bar Louie

From 11 a.m. to 3 p.m. on National Cheeseburger Day, Bar Louie patrons can order the Louie’s Choice Cheeseburger, served with fries or tots, for just $9.95. Prices and participation may vary by location.

Buffalo Wild Wings

When Buffalo Wild Wings Blazin’ Rewards members buy one burger on September 18, they’ll get another one free. Offer valid for dine-in, takeout, and Buffalo Wild Wings GO orders.

Burger King

Burger King Royal Perks members will receive a free cheeseburger on September 18 when they spend $1 or more.

Carl’s Jr.

Carl’s Jr. rewards members will be treated to half-price double cheeseburgers on in-app, online and in-restaurant orders on September 18. Offer valid for up to four double cheeseburgers per order at participating restaurants. Offer may not be combined with other discounts and is limited to one offer per registered user.

Dairy Queen

From September 16 through September 22, Dairy Queen customers can get a free Double Original Cheeseburger Signature Stackburger with every app or online order of $1 or more at participating DQ Grill & Chill locations nationwide. Offer is limited to one per customer.

Denny’s

Denny’s rewards members get 20% off any burger on September 18, including the limited edition Beetlejuicy Burger. Offer valid at participating locations for dine-in or online orders and requires an $8 minimum purchase. Offer cannot be combined with other discounts.

Dog house

Dog Haus is running a buy one cheeseburger, get one free promotion on September 18 for rewards group members. The offer is available on the chain’s app.

Eddie Merlots

On September 18, Eddie Merlot customers can order Eddie’s Prime Cheeseburger for $15 between 4:00 p.m. and 6:30 p.m. Prices and participation may vary by location.

Farm burger

Grass-fed burger chain Farm Burger is running a build-your-own cheeseburger promotion on National Cheeseburger Day starting at $5.

Farm boys

Farmer Boys customers can order the chain’s Big Cheese burger for just $4 on National Cheeseburger Day from 2 p.m. to closing time at participating locations, while supplies last. The offer cannot be combined with other deals, is limited to two burgers per customer, and is available in-restaurant or in the drive-thru.

Members of Very Important Farmer (VIF) also receive an extra surprise when they scan their receipt.

Friendly

Friendly’s Fan Club members can save $2 on cheeseburgers between September 18 and 20.

Hat Creek

Hat Creek customers who order the Little Hat Burger through the chain’s app will get the menu item for just $2 on Sept. 18.

Instacart

Instacart customers get $10 off their $20 purchase from the National Cheeseburger Day product collection, which includes meat, cheese, buns, condiments and more. The offer is valid at select retailers through Instacart.

Crystal

Krystal is currently running a limited time offer: 12 Krystals with cheese for just $15.

McDonald’s

McDonald’s customers who order through the chain’s app can enjoy a double cheeseburger for 50 cents on September 18.

Omaha steak

Omaha Steaks is offering the following specials in honor of National Cheeseburger Day:

Robin

From September 17 through September 19, Red Robin customers can get a Gourmet Cheeseburger, unlimited beer and a drink for just $10 (regularly $14.99 or more) while dining 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 in-store, online and in the restaurant’s app on National Cheeseburger Day with the code CLASSIC24. The offer includes Classic Singles, Classic Single Turkey Burgers and Classic Single Black Bean Burgers.

Sullivans Steakhouse

From 3 p.m. to 6 p.m. on September 18, Sullivan’s Steakhouse customers can order the restaurant’s signature beef burger sliders for just $10. Prices and participation may vary by location.

Wahlburgers

Wahlburgers adult burgers are 50% off on September 18th at participating locations. Offer is valid in-store and online, excludes doubles, triples, sandwiches and Smahlburgers. Limited to one per customer and cannot be combined with other offers.

Wayback Citizens

Wayback Burgers is running a buy one, get one free promotion on September 18th on their classic burgers.

Wendy’s

From September 18 to September 22, Wendy’s customers can get a Jr. Bacon Cheeseburger for $0.10 with every purchase they order through the app at participating restaurants.

Whataburger

On National Cheeseburger Day, Whataburger is rewarding members who place an in-app or online order for a patty melt, Sweet & Spicy Bacon Burger or a Whataburger with cheese for a chance to win a 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 take advantage of the deal, simply use the code SAYCHEESE in the restaurant’s app.

Additionally, through November 10, customers can purchase a bag of 10 cheese sliders for $7.99 ($8.99 in New York, New Jersey, Florida and Arizona).