I wanted to write EVERYWHERE, but I'll give you a list. Some of the best places I've ordered from are no longer in business.

Marietta
Maryott's
Aren't I Pretty
Patron Gardens
Sunset Meadows
Daylily Manor
Ridaught Daylilies
Crintonic Daylilies
Heavenly Daylilies
Floyd Cove
Art Gallery Gardens
The Lily Farm

But most of my daylilies have come from the Lily Auction, a variety of sellers over the years.

Debra

I love Maryott's, Marietta, (both send great plants and bonuses...Maryotts are unreal bonuses) Ridnaughts's (good prices) and Roycroft has some of the prettiest introductions to me since I love eyes. Art Gallery Gardens sends fabulous plants and bonuses. Slightly Different Nursery (Paul Owens) Plants perform fabulously. The lily auction ah yes, the lily auction. And several others I can't think of right now.

kay

I realized I left some of best ones of my list. So here is my Part 2

Ladybug Daylilies *****
Bee Bayou Daybloomers *****
Daylily Haven Iris Gardens *****
JTM Gardens *****
Iron Gate Gardens *****
Country Lane Daylilies
CT Daylilies
Soules Garden
Misty Valley Farm
Sassafras Gardens

Five stars indicates more than two fans on cultivars and fabulous bonuses.

Debra

My favorites are the ones marked wih an asterisk.
Maryott's *
Art Gallery Gardens *
Ledgewood's Garden *
Marietta Garden
Patron Gardens
Ridaught Daylilies
The Lily Farm
Floyd Cove *
Blue Ridge Daylilies
Roycroft Daylilies
Joiner Gardens *
Browns Ferry Gardens
Water Mill Gardens *
Gold Coast *
I also used to order from Salter... Still Bill & Marilyn Maryott is my favorite. I have done business with them before either of us had daylilies. We were both Iris growers then LOL!! Ellie

Since joining the AHS in 1997, I've ordered from nearly everyone! Here are some I've bought from, many of them multiple times, and would order from again. Nowadays I almost always order plants directly from their hybridizers.

Ledgewoods Garden ( Abajian)
Valley of the Daylilies ( Bachman)
Bell's ( Tim Bell)
Bobbie Brooks
Lily Farm ( formerly Jack Carpenter and Josie Bomar.)
Pat Cochenour
B.J. Crichton
Judy Davisson
George Doorakian ( Nor'East Daylilies)
Don and Nancy Eller
Karol Emmerich
Jamie Gossard
Larry Grace
Ladybug ( Dan Hansen)
Crintonic ( Curt Hanson)
Tim Herrington
Sandy Holmes
The Joiners
Kinnebrews
Daylily World ( David and Mort)
Art Gallery ( Luddy Lambertson)
Melanie Mason
Linda Michaels
Michael Miller
Richard Norris
Ted Petit
George Rasmussen
Margo Reed and Jim Murphy
John and Annette Rice
Kem Roberts
Bret Clement
Frank Smith
Iron Gate ( Van Sellers and Vic Santa Lucia)
Bob Schwarz
Floyd Cove (Stamiles - now Pierces)
Bob Tankesley Clarke
Dan Trimmer
Bill Waldrop
Nan Wilkerson

A few secondary sources I've ordered from that I'd order from again:
Ric-A-Tee
Bonner's Sunshine Garden
Several sellers on the Lily Auction

A few sources which I no longer choose to order from:
Rollingwood Gardens
Guidry
Shooters
Roycrofts
several sellers on the lily Auction

Interesting to see where people have ordered from. Here's my (much shorter) list, in no particular order or preference:

Marietta Gardens (Shooters)
North Country Daylilies (M. Mason)
Oakes Daylilies
Olallie Daylily Garden
Betty's Country Gardens (no longer in business - she retired)
G. H. Wild
Lily Auction

This year I ordered from Melanie Mason (amazing huge plants), and G. H. Wild (small plants, but they had a couple particular oldies that I wanted).

Laurel

Maryotts
Marietta
Blueridge (Bob Selman)
Westbourne
Pinewood Gardens (Korth)
Ashwood Gardens (Norris)
Melanie Mason
Springwood Gardens (Emmerich)
Don Herr

These days I too either order direct from hybridizer or just buy on the Lily Auction. I am sure there are more than what I listed but these are all ones I easily remember and recommend.