Bates Water Gardens
Sells daylilies, perennials, water garden and pond supplies.
http://www.bateswatergardens.com/
Barracott Plants
Nursery in the UK specializing in unusual perennials, especially woodland and shade-loving species. Text catalog, order by e-mail or phone.
http://www.barracottplants.co.uk/
Alaska Hardy Perennials
Cold-hardy perennials grown especially for Alaskan gardens and landscapes.
http://www.alaskahardy.com/
A&D Nursery
Washington state nursery traditionally specializing in herbaceous and tree peonies also offers daylilies and hostas. Catalog with some photos, printable order form.
http://www.adpeonies.com/
