Subway still has their special featuring select footlong subs for $5 every month. The $5 Footlong for May, 2013 is Meatball Marinara. This joins the regular lineup of $5 footlongs, including BLTs and Black Forest Ham. No coupon required.
Also in May for $6 get a Smokehouse BBQ Chicken, or get an Oven Roasted Chicken 6-inch sub for $3.
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).