Are traditional watermelons to large for your small grocery store? Rather than not sell watermelon, see if you can get it to grow in a shape that does fit. Link to story on hardknoxlife.
I think this is a great lesson in creativity - just because it hasn't been done, doesn't mean it can't be. This also had me thinking about distributed learning and the exiting things that we can now do. Who says you have to live in Minnesota to be a Luther Seminary student? With online learning you don't have to. Sure it looks a little different, but like the square watermelon, it solves an issue that used to be a big problem.
I want to try a square watermelon - I bet it's just as tasty, and would even fit better in my fridge.