If I were you I would find a place in Dalton being that your so close, that way you dont have to pay for shipping. It usually comes in 6 or 8 ft widths, so yes you would want to measure the widest part and buy accordingly.
If you dont want to go to Dalton Boatcarpetbuys.com is a great place, had my 20oz. 25 x 6 roll in 3 days for $187!
If you come up to Chattanooga any I got 90% left of a gallon that you could have for $20.