You are not too far from my zone(8a). I'm in the Stone Mountain area. There are so many online daylily gardens to order from, and a favorite among us is the Lily Auction. You set up an account and bid on plants. It's fun and a good way to get plants at a good price if you are lucky!
https://www.daylily.com/cgi-bi...
One of my favorites here in Georgia is Shady Rest Daylily Garden. It is located in Cartersville, about 45 minutes from Atlanta. The owners Doris and David Bishop are wonderful to do business with. I've also gotten several nice plants from Gibbs Garden in Ball Ground, Georgia. They have a wonderful daylily display garden with acres of dayliles. They also have hundreds potted up for sale starting around mid June.
http://daylilyfans.com/bishop/
https://www.gibbsgardens.com/
A few others that have ordered from year after year with excellent results are Park Lane Daylilies , Oakhill Daylilies, Wynn's Daylily Garden, Marietta Daylily Gardens, Dancing Daylilies, and BlueRidge Daylilies. They all offer large, healthy fans and bonus plants. I have attached links for all of the above.
http://www.parklanedaylilies.c...
https://oakhill.plantfans.com/
http://www.wynnsdaylilygarden....
http://www.mariettagardens.com...
http://daylilyfans.com/dancing...
http://www.blueridgedaylilies....
There are several other daylily gardens that I have heard good things about, but have never ordered from. They include Bell's Daylily Gardens, Watermill Gardens, Gaskins Daylily Garden, Browns Ferry Gardens and Floyd Cove Nursery.
https://bellsdaylilygarden.com...
http://trimmerdaylily.com/
http://gaskinsdaylilygarden.co...
http://www.brownsferrygardens....
http://www.floydcovenursery.co...
Be warned...daylilies can become highly addictive. You start out with a few and before you know you have run out space in your garden. You start looking to buy the property next door just to feed your addiction!