Hey Josie,
From what I've heard, Kelly Cratty's line is great! You should email Angi H. from CA Chickens if you are a member over there. She's bringing me a pullet from her K. C. pen and I believe she's got some chicks that she'll be selling at Fresno.
As for buying Quality Marans, look for well know breeders. Bev Davis has awesome Marans. If you buy from hatcheries, odds are the egg color wont be the best, and I've heard that Ideal sells Marans crossed with BRs. Im a novice with Marans, and Im just going by what I've read and heard. Oh, and Gina! I believe her SN is Ginasmarans. She's got nice Cuckoos, but I think she only sells hatching eggs. Good Luck!
FORGOT TO ADD: Just because they are being sold as Cratty Marans does NOT mean they are. Sometimes people that are just lookin for money will buy hatchery birds, find a well known breeder name, and sell their birds as that breeders birds. Its terrible, but it something that happens alot. I've heard it happening with Hattrick Silkies a lot, I believe. Make sure you ask for pics of the birds, and the eggs, and if possible, as to see the eggs in person if you meet with them. It would be terrible to get home and find out you got some BR X Marans mixes from a hatchery or somethin!