Subway still has their special featuring one new footlong sub for $5 every month. The $5 Footlong for January, 2013 is a Chipotle Chicken and Cheese. This joins the regular lineup of $5 footlongs, including BLTs and Meatball Marinara. No coupon required.
For the complete $5 footlong menu see the Subway website: http://www.subway.com/Menu/MenuCategoryItems.aspx?CC=USA&LC=ENG&MenuTypeId=1&MenuId=53
About Subway (from Wikipedia)
Subway is an American restaurant franchise that primarily sells submarine sandwiches (subs) and salads. It is owned and operated by Doctor’s Associates, Inc. (DAI). Subway is one of the fastest growing franchises in the world with 37,881 restaurants in 98 countries and territories as of November 7, 2012. It is the largest single-brand restaurant chain globally and is the second largest restaurant operator globally after Yum! Brands (over 37,000 locations).