Does anyone know of an inexpensive but good quality hotel in marietta or atlanta GA?

Im turning 13 and for my birthday my parents said i could invite 6 friends to stay at a hotel with me either in either atlanta or marietta, but they said they have to stay in a room down the hall and i cant find any hotels that would be inexpensive and still good, or that would hold 6 kids in a room by themselves. all the hotels say you need an adult in a room with you and we DO NOT want that... any ideas?
im also looking for a limo service less than $300 from 5:30 P.M. to about 9:30 P.M... any suggestions?

They have great deals on hotels in Atlanta at http://cheaphotelatlanta.tripod.com

find the best hotels........

First and foremost... NO hotel will allow a minor stay rent a room, much less 7 - to much of a liability. Second, what are your parents thinking to let a bunch of 13 year old overnight in a hotel alone?