My local paper reprinted an article on daylilies by Norman Winter of Savannah, distributed by the Tribune News Service. (I am not sure why since our local paper employs a regular gardening columnist who knows the local climate.) Mr. Winter, however, has introduced me to the term hemerocallis, the genus for daylilies, and the American Hemerocallis Society, also based in Georgia, which sponsors daylily Display Gardens, over 330, all over America. These are not places to buy daylilies, only to look at them, and many are part of private homes. In Georgia, apparently, these already boast beautiful blooming hemerocallis.
The Society website will not only guide you to Display Gardens, but to daylily exhibitions and to gardens in your region which sell daylilies. Some feature incredibly beautiful plants, whose prices for a single cultivar can range as high as $175, but others have completely reasonable prices for, admittedly, less exquisite varieties. Although there are undoubtedly many more gardens close to you than are listed by the Society, most on their list will do mail order business. The url is: http://www.daylilies.org/index.html.
Rainbow Equus from Greywood Farm in Topsfield, MA, cost $175 before it sold out.