Whether you like them from the fast food line or straight from the grill, lovers of cheeseburgers can rejoice Sunday as they get their opportunity to celebrate National Cheeseburger Day. For those with slim wallets or just pinching pennies, there are plenty of opportunities to get your hands on a free burger at some pretty stellar restaurants to celebrate the occasion.

Here’s where you should take a look for a free meal:

Ruby Tuesday

If you buy an adult entrée at your neighborhood Ruby Tuesday, the restaurant will thank you with a free burger up to $10 in value. There’s a catch: customers can only redeem the coupon if they sign up for the restaurant’s SoConnected email club.

On A Plane

Delta Airlines will be delivering Shake Shack burgers on select flights if they’re flying from New York’s JFK airport or Los Angeles’s LAX airport. Some customers will also get an added perk with a voucher for a free Shackburger at the West Hollywood Shake Shack.

Black Angus Steakhouse

Head over to Black Angus Steakhouse and you’ll be offered up a coupon for customers to get any lunch entrée for $8.99. That includes the Steakhouse Backon Cheeseburger and Guacamole Burger, according to CNBC. The offer is available until Monday.

Burger 21

Burger 21 is offering a free “Cheesy Burger” if you download their mobile app. You don’t even have to actually grab the burger Sunday, the offer is available for up to 30 days after you download it.

Dog Haus

So, you won’t actually get a free burger here but you’ll get a free upgrade. On National Cheeseburger day you can get a free update to a double patty on its haus burger. That’s an upgrade that usually costs an extra $2.49 a patty.

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