The deal: Use your skills on the 'gram to take a picture of your lunch at Potbelly today, tag it with #NationalSandwichDay, #PBEntry, and @PotbellySandwichShop, and if you get the most likes after 24 hours, you'll win a $500 gift card to the fast-growing sandwich chain. Second and third place winners get free food too.
When: Today, Nov 3rd, as long as Potbelly is open
The deal: Most other sandwich chains make you download an app or sign up for something, but Schlotzsky's deal is as simple as it gets: buy one medium sandwich and get one free.
When: Today, Nov 3rd, at a Schlotzsky's near you
If that doesn't make you hungry, maybe our list of the 50 best sandwiches will help.