Get yourself some fresh "Rootone", "Bonide" , or similar rooting compounds and make your own cuttings .
You might be able to perpetuate the species and the qualities that you like thru experimental cross-breeding.
Met-Mom is quite correct about the Cavendish banana - I believe that genetics allow for some 42 genetic generational cuttings,
so it's commercial value declines as its genetic resistance to disease declines.
Credit goes to exDemMom.
I never heard of the Cavendish banana.