Maybe because it is hard to grow it.
According to wikipedia:
"Some species, such as Eulophia euglossa, have adapted to very arid environments and are among the few orchids to have truly evolved desert living species. In the frost-free, semi-arid areas of Southern California, many Eulophia species, such as E. macra, E. petersii, E. plantaginea, and E. speciosa, can be grown outdoors year-round in well-drained pots with cactus/succulent potting mix (although E. speciosa prefers being grown in pure white sand), as long as they are given ample light through the winter and a drier winter resting period. Warmer growers, such as E. pulchra, E. keithii, and possibly even the extremely rare and difficult E. cucullata (the foxglove orchid), can probably be grown outdoors in the warmer areas of Florida and Hawaii, also"
-maybe that is the main reason why only a few will grow it indoors on greenhouses much less sell it...
good luck in finding your plant...
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