First let me make a statement, "I just don't need another banana plant".
However, I just got back from my neighborhood Lowes and saw a whole bunch of gran nains.
All were marked 'Gran Nain' $24.99. The big ones had already gone through a winter and had signs of being cut back. They also has a few pups with each big plant. IMO these might be an ok value based on the size and girth of the plants.
The small ones seem like they are mis-ID'd as GN and that price is high. However there are a lot of plants per container.