There are six species in the Hadrolaelia group.
Laelia pumila
IOSPE PHOTOS
Laelia dayana
IOSPE PHOTOS
Laelia sincorana
IOSPE PHOTOS
Laelia alaorii
IOSPE PHOTOS
Laelia praestans (synonym spectabilis)
IOSPE PHOTOS
Laelia jongheana
IOSPE PHOTOS
They might be reclassified as Cattleya now. I highly recommend looking at more pics of each species since IOSPE doesn't always have the best pics and many of these species come in other color forms. Miranda Orchids also has a lot of great info on these species. He has a page that explains the difference between some of the species since some look very similar if you are not familiar with them.
Miranda Orchids, Orchids of Brazil
Sorry about the misspelling of Hadrolaelia in the first post. My phone auto corrected the spelling.
US-
Santa Barbara Orchid Estate-
L. dayana starting at $17.50
L. pumila starting at $25 (they have quite the variety)
L. praestans starting at $25
L. Susanna primary hybrid between pumila and dayana starting at $17.50
L. sincorana starting at $25
Diamond Orchids (highly recommended by me)-
L. alaorii $20
Europe-
GroBräschener Orchids-
L. alaorii EUR 21.00
L. sincorana var coerulea Flowering size 1 year EUR 27.00 (around $50 in US)
Orchid Species-
L. jongheana BS £24.99
Schwerter-
L. (pumila x praestans) 'CT Little Red' EUR 12.95
Elsner Orchideen (not sure the size since I couldn't read anything!)-
L. alaorii EUR 21.95
L. jongheana EUR 9.50
L. praestans EUR 19.95
L. sincorana var coerulea EUR 19.95 (at least $50 in the US)
Nardotto e Capello Shop-
L. alaorii BS € 18,00
L. (alaorii x praestans) BS € 18,00
L. pumila BS € 14,00
L. sincorana BS € 14,00
L. (sincorana x alaorii) BS € 12,50
L. sincorana var coerulea BS € 15,00 (at least $50 in the US)
Canada-
Paramount Orchids-
L. dayana NFS $28
L. pumila FS $30-$32
I'll keep updating this post with more vendors and choices in each country.