I'm not sure, it isn't the season for watermelon, so that might be way.
All kinds of places to call, Walmart, Target, Trader Joe's, Whole Foods, Jewel, Mariano's and Farmers Markets that pop up all over the city.
That would be very difficult to find. Unfortunately, watermelon is mostly GMO everywhere. I recommend trying at the weekend local farmers markets when they come in the spring.
You need to call the market or visit to see if the store has seeded watermelon.
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