Cool growing Bulbophyllum species?

[Exo]

I've been on the lookout for cool growing species of Bulbophyllum, particularly ones native to the cloud forests of Borneo, Sumatra, and the Philipines, but it's been hard to even make a wishlist, since most seem to be either very rare in cultivation...or are simply hard to find listed anywhere at all. Can anyone name some cool growers from these regions that are found in cultivation? Thanks.