Hopefully this helps,
Price Explanation: When shipping any sort of Agricultural product overseas, it requires a certified inspection. Phytosanitary certificate; verifies agricultural products have been inspected and are pest and disease free, and to just get an inspection for a single plant it can be pricey. So for sellers on the other side of the world to make decent 1st world cash, it offers incentive to reach out to the western market.
I was doing some digging on different cultivars and found a simillar one the other day.
Looks like these are from Thailand, found a webpage with a similar listing.
-1 Bulb of Musa Kluai New Nang Lum Banana Plant
https://www.thailandplant.com/Amorph...3fcik5cmu394f7
and I found a purple Kluai Nam Wah ABB that had similar coloring when ripe to the ones you asked about.
The cross section of the banana looks like a namwah too.