Yep they were from RPS. I think the Klauy Pa need temp fluctuations, or luck.
I like trebrown alot. They have good prices on Musa and palm seeds, and Phil has traveled around a set up people in places like Tawain, and PNG to harvest seeds. The only thing is you must meet the minimum $100 on wholesale quantity.
Bananatree is a good cheap source, as well as ortanqiue, and RPS has some one of a kind.
Another one you didn't mention is Sunshine seeds. They have some questionable names on some of the seeds, but so far I think they are legit in some of their making up new names for species that vary a little. It's tough to order from them since the site is in German, but a fax seems to work for ordering.
Oh yeah jungleseeds has one of the best little full color catalog of rare Musa and other tropicals, and they have a new species that has a crazy bright purple flower(Musa sp violet).
I just tried to get another superbum in a trade, but got denighed, and the following day I looked and there was a kluay pa sprout.
I hope you get some M.ingens to sprout, and maybe tissue culture it for us banana nuts.