long-term parking near Atlanta airport?

I am looking into spots where I can park near Atlanta airport. I will would like to park for about 1 and 1/2 months. I am willing to take Marta train if there is a cheaper place (or free) to park. Any suggestions?
Thanks, all. I live in North Georgia, so I have to drive a long way down south anyway. But I got a hold of one friend to drive me down there. Thanks ya'll.

Looks like the price of secure, long-term parking at MARTA stations ranges from $4 to $7. I've parked at the Lenox station deck. When I came back from my trip, my car was just as I'd left it. :)

Have a friend drop you off at the MARTA station and keep your car parked at home.

umm definitley have a friend drop you off or else u r looking at some pretty big charges.