I signed up for the Arby's Extras on their web site (https://arbysextras.fishbowl.com/forms/arbys/join.asp) a long time ago.
Since signing up, I receive regular emails from them with different offers and they usually involve a free sandwich.
Today, I got a coupon for a free Jr. Deluxe with the purchase of any drink, excluding coffee and value sized drinks. There's always an expiration date (this one is 7/27/10). One coupon per person, per order, per visit.
So sign up and save some money on lunch!