A while back I bought some banana seed from rarepalmseeds, and none of them sprouted. I had bought Burmese Blue as well as Musa velutina.
I have no idea how long they were in storage. I've since grown my own Musa velutina from seed and they sprout without any trouble.
Do you know if banana seeds need to be fresh, or can they remain viable for years? Does anyone know of honest sellers that are committed to selling good seeds?