If you decide to not carry a "real" map, which is basically fine for the AT you can buy a couple of pocket maps that will give you pretty good information for the parts that you will walk. They are around 18"x4", 2 sided and are easy to carry and use. You're not going to get the detail that you get from a normal topo map but it does give decent data such as milage, elevation, water, shelter, roads, etc. Again, they are not intended to replace a good topo map but they will work in a pinch for the AT. Here's the link: http://pocketprofilemaps.com/appalachian-trail.html
If you buy the individual ones you will need AT-1 and AT-2. They are $3.95 each or you can buy the whole southern set for $19.75. It's too bad that you're not near an REI because they carry them. Otherwise you will need to order them or pick them up at Amicalola, Fontana or a number of other places before you hit the trail.