Locate you nearest Landscape Designer or Landscape Architect.
Order a lot of plants from your designer or architect and ask them to get them from Devil Mountain Wholesale Nursery. (This wholesale nursery works with designers and architects only)
I had the pleasure today of visiting this excellent Nursery. All the plants are orphans and need a new home. Not to mention already happily espalier'd fruit trees, pomegranates ready to eat, and adorable topiary if that is the stuff you like. You cannot lose.
Pictures of plants at Devil Mountain: