You can purchase many of these varieties from:
Stokes Tropicals
1-800-624-9706
Going Bananas
Homestead FL 33032
(305) 247-0397
J.D. Anderson Nursery
Fallbrook, CA 92028
http://www.jdandersen.com/
949-361-3652
Their website lists more than 50 cultivars.
I've grown many of these bananas plus other varieties. I would recommend either Grain Nain (Chiquita), or Williams Hybrid
Millet (665-)