I just saw an ad for this. Better deal if you score discounted gift cards. May be a ymmv depending on location.
$5 Cheeseburger Offer is valid on Cheeseburger only. Valid for online ordering (with minimum purchase of $10 or more when ordering from TGI Fridays) or Dine-in. Valid for a limited time at participating locations. Tax and gratuity not included. Delivery and service fees may apply. No coupon necessary. No substitutions. Unless required by law, offer cannot be redeemed for cash. Not replaceable if lost or stolen. Not valid in conjunction with any other offer, coupon, promotion, discount, Choose 2, or Endless Apps®. Limited time only, while supplies last. Not for resale. Offer valid only in U.S. © 2019 TGI Fridays Franchisor, LLC