This fishy deal is an easy catch for Arby’s customers. Known for its roast beef sandwiches, Arby’s has dived into new territory with its very popular Reel Big Fillet Fish Sandwich (reg. $2.99.) The sandwich is even ranked #1 among 5 fast food chains, according to grubgrade.com. For just $5, you can get two fish sandwiches or a fish sandwich combo (sandwich, small fries and small drink.) The deal is for a limited time at participating locations.