Fat-Plants Yahoo Discussion GroupThis is a highly recommended discussion group about caudiciform type plants. It consists of growers and hobbyists from around the world who come together to share their experiences growing these great plants. The discussion group currently has more than 700 members and has been around since November, 1998.
Bihrmann's CaudexAn excellent source for particular species information can be found on this site. Literally hundreds of caudex forming species are described on the site.
Rare SucculentsRare Succulents Nursery is probably the world's best importer and grower of rare caudiciform plants, mostly from East Africa and Madagascar. The staff at this by appointment only Southern California nursery is very friendly and always willing to answer questions about growing fat plants. Their offerings are of medium to large sized, well developed caudiciform plants.
cactus-mall.comGreat resource for information on cactus and succulent plants.