Arby's is thanking its guests in the Tri-Cities with $1.29 Classic Roast Beef Day. On Tuesday, August 7th, 2018, Arby's classic roast beef sandwiches, normally $3.49, will cost only $1.29—all day long. Come to any Arby's in the Tri-Cities to take advantage of this offer. Participating locations are in Abingdon, Bristol, Johnson City, Kingsport, Greeneville, Blountville, and Jonesborough. There is a limit of 20 classic roast beef sandwiches per guest.