There are also available from time to time (here in VT anyway, and obviously we don’t grow theme in-state) red bananas, which I haven’t tasted.
You’re right, there don’t seem to be so many banana types available, but I suspect that it’s more a case of what will ship well and be profitable, since you can’t grow them in 99% of the USA. We only commonly get 2 varieties of dates, as another example, but there are hundreds of different types being grown in the Middle East. Just not enough demand for the exotic/higher priced ones, or they don’t ship as well…could be a lot of reasons. But I would guess that there are several other types of bananas out there that we in the continental USA (except maybe Florida) don’t ever see.