http://www.bihrmann.com//caudiciforms

Bihrmann's Caudiciforms is a large site containing photos and information on most fat plants in cultivation including Adenium arabicum, Adenium boehmianum, Adenium multiforum, Adenium obesem, Adenium oleifolium, Adenium socotranum, and Adenium somalense.

http://cactus-mall.com

The Cactus and Succulent Plant Mall is an Internet resource for all growers and collectors of cacti and succulents plants. You'll find growing information along with links to societies and nurseries offering plants for sale.