Welcome, Johnny. Which species (or hybrid) of Disa are you looking for? I assumed that you are looking for stream-side Disa (like D. uniflora, D. tripetaloides). Wally is one of the major Disa grower/hybridizer, and he has lots of hybrids as well as the stream-side Disa species. I'm interested in only species, so I got D. uniflola, D. tripetaloides, and D. aurata from Wally in spring 2014 (I'm pretty new to Disa). I posted a
photo of D. aurata in another forum. D. uniflora flowered, but it didn't make the next tuber. So this summer, I got 6 or 7 additional D. uniflora seedlings (about $10 for a seedling). I haven't figured out how to grow them, and it is pretty challenging for me. Wally has several articles published about Disa culture (I think it's in Orchids magazine).
Tenman's web site if pretty fun to read:
disaculture
This ebook is a good deal:
A Disa Companion: The Art and Science of Disa Cultivation - Eric Harley, Sid Cywes, Peter Linder - Google Books