1. Rhododendron Species Foundation Association sells tropical and temperate species of rhododendrons to association members and others. http://www.rhodygarden.org/
2. Singing Tree Gardens California seller of hybrid rhododendrons, as well as some azaleas and ornamental trees. http://www.singtree.com/
3. Species Unlimited Western Washington nursery specializing in propagating and growing species rhododendrons and azaleas. http://www.rhodospecies.com/
4. The Bovees Nursery Oregon specialists in vireya rhododendrons of Indonesia and Southeast Asia and their hybrids. http://www.bovees.com/