fernSiam.com -- Large fern site in Thailand. In Thai, but with latin names and many nice Platycerium photos.

 American Fern Society  -- Join to receive the American Fern Journal, and access to the society's spore exchange.

 Keith's Fern Page  -- Includes information on raising ferns from spore.

Rareferns.com-- Charles Alford of Florida offers tempting staghorn plants at reasonable prices.