I don't know if they have nationally but here Safeway have Friday 5-dollar deals!  They are good!
 
American Sub for $5 feeds me for a few meals.  My favorites is the fried chicken and the turkey pot roast.  The sub and roast chicken are good too.  Each week they have something for $5 on Friday, good deal for 5 bucks.  Just Fridays.  We live in the SF Bay Area peninsula so I don't know if it's everywhere the same.
 
This sounds like Safeway ad but it's not!  I like Costco food court too.