Some online growers are here like Jeffrey sells banana pups. The polyester blanket is best if you dye them to dark colors and you can drape them over the entire winter. I did that to my bananas and have observed prolonged protection compared to other folks in our area, but the problem is the very strong winds that blow them away, followed by very clear early pre-dawn and calm winds and cover blown away, I just couldn't win this winter. I will anchor the covers much better next season's winter.
www.going-bananas.com would usually sell with the correct cultivars. A little bit more expensive than others but their plants are top quality. Avoid the eBay tissue cultured plantlets like the plague. I've had many mislabeled cultivars from those cheapo plantlets and knew only after 3 or 4 years. With growing-bananas, so far they are 100% correctly labeled.
I don't sell my banana pups, but just give them away if there's available and you come and dig them out, or have an exchange. But after testing more than 80 cultivars in my yard, I have stopped exchanging bananas, only with other scionwood, but I am always at the losing end when it comes to postage due to the weight of the pups and so have minimized my exchanges altogether.
I have already given about fifteen California Gold pups for free, have given away more than 20 Dwarf orinoco pups for free, Misi Luki, Mysore, Raja Puri, and about 15 Dwarf Brazilians, I have given away more than 200 banana pups for free todate. Sometimes I exchange them. Even if I would sell them for $50 each pup, they are not simply worth the effort (digging, cleaning, packaging, mailing, trip to post office, time lost in all these could not be compensated for $50, so why bother?), so I just give them away if you come and get them. But for exchanges, I would do the whole nine yards. If the Ae-aes are cold hardy enough when planted inground and would grow back every spring, I would have planted a lot and give them away for free, but mine died even at temperature of 40 deg F, they are simply not worth it.
I'm keeping only 8 banana cultivars in my yard in main residence (have about 2 dozen in my other properties) and won't bother with anything anymore unless there is a new cold hardy cultivar recently introduced by FHIA.