Palm Springs Nurseries/Plants

I'm working on a landscape design for a friend's friend and not finding the best selection in the few Palm Springs Nurseries that I've found. Anybody aware of wholesale/retail nurseries maybe in the LA area that have good selection of material? So far the design includes some large Palo Verde's, Opuntia Santa Rita, possibility of Agave attenuatas or Aloe tree forms but they'd have to be larger speciments (#15+). The clients prefer the simplicity of bold lines plants such as Mexican fence-post cacti (Cereus?) and the Washingtonias infront of their Brady Bunch house.

Post this in the Cactus and Succulent forum as well as there are several regulars on there that may be able to help.