I saw from David the good that this type of velvet bean is used as a cover crop in hot humid climates and I’d like to try it here in South Carolina. It’s very similar to kudzu which does extremely well here to say the least LOL. If anyone is a knows a good source lemme know. Thx! 
I found some on Etsy, just now.
Last year I bought some from Good Gardens. I have not planted them yet.
Yes I had seen some on Etsy as well, I guess that’s where I’ll have to get them. If I do grow them I’ll try to save a lot of seed. Hard to find and a bit pricey.