Greenman,
In the US Doug Pulley (CA) is the top Stan grower:
http://dpulleyorchids.com/
South America: try Ecuagenera (Ecuador):
Ecuagenera - We are where beauty resides in life: in the simplicity of an orchid.
In Brazil few nurseries can export plants; try Bela Vista Orchids (2 or 3 Coryanthes, Stan and Paphinia)
:: Bela Vista Orchids - Assis/SP/Brazil
Good shopping!!
Frederico