Cactus Heaven - Carries both plants and seeds. 

 Brookside Nursery 

 Seedling Cacti - Looking for seedlings?  Well here is your place.  You can enjoy growing baby cactus with out the trouble of sprouting them. 

 Garden World 

Abbey Garden Cacti and Succulents (California) 

American Desert Plants Arizona 

Arizona Cactus Sales (Chandler, Arizona) 

Blue Diamond Nursery 

Burks' Nursery (Arkansas) 

The Cactus Hut Retail outlet for plants, seeds, cactus gardens and related products 

Cactus King Nursery 

Kactus Korral (Wholesale) 

California Cactus Center 

Chesapeake Plants Cacti, succulents, tillandsias and carnivorous plants 

Craigs Cacti and Succulents 

Desert Gardens 

Ecoscape Aloe polyphylla 

Glasshouse Works 

GreenWeb 

The Great Petaluma Desert (California) 

John Shelley's Garden Center & Nursery 

Living Stones Nursery - Plants for the Southwest 

Maccactus Cactus and Succulent Nursery (Georgia) 

Mesa Cactus Sales 

Miles' To Go A very extensive number of photographs 

Peltech Nursery 

Phoenix Desert Cactus Nursery Wholesale, landscaping specimens 

Plant Delights Nursery Many unusual plants including quite a few hardy succulents 

Rivenrock Gardens Edible Cactus Nursery 

SBE's Worldwide Cacti and Succulent Seedlist 

Squaw Mountain - Sedums, Sempervivums and other plants 

Serra Gardens Landscape Succulents 

South Bay Growers (Florida) 

Strongs Alpine Succulents (Arizona) 

Sunrise Nursery Texas 

Still haven't found what your looking for?  Try  Cactus Mall;  They have a large selection of dealers.