I have seen them at the Whole Foods in Foggy Bottom

I read something that said almost all the commercial bananas in the world now are Cavendish, and that a blight is making its way through the banana-producing world attacking them too. The perils of monoculture. When those are wiped out, we're going to have to find the next new banana to eat.

Hi OP, the Gros Michel were mostly wiped out in the 1960/1970's due to a fungal blight problem. You can sometimes find them in asia because the Thai and Singapore plantations were not affected by that blight. I don't think I've seen them in the U.S. for about 30 years, which is a shame...

I've been looking forever, but it seems mosrtly you find Cavendish