Try cavandish or dwarf cavandish or even Saba. It will be hard to get below 50c/lb for even home grown bananas when you take into account all you will have to put into growing them.

In this case, since economy isn't the issue, I'd like stellar taste. I'm really blessed to live in a climate that allows me to grow 90% of what I'd like to grow.

Is there a specific grower or nursery I should look for? (or look out for, for that matter?)

I have several varieties, but my favorite is blue java/ice cream. grows well here, and it's not one you can get in stores. Mysore is a smaller sweet banana but It tends to be more cold sensitive and doesn't do as well. Goldfinger is productive and was developed to become a commercial variety so isn't much different than what you can buy. Saba are said to be the best tasting plantains, mine do very well and when ripened on the tree can be eaten like dessert bananas ( but we don"t). Kru is said to be very good but mine haven't done well, seem to be more cold sensitive also. the punch line is that if you, or anyone else, lives close enough to pick them up, I can give you pups of saba, ice cream and goldfinger.
I also will have a couple monzano, cardaba. e-mail me. I check it every two or three days. I live close to 91-605

That would be lovely. Part of the fun with gardening with the kids is I never know what they'll ask to grow next.