In all entries of the Animal Crossing series that scorpions appear in, they sell for 8,000 bells at Tom Nook's store. In Animal Crossing New Horizons, when Flick visits your island, you can sell scorpions to him for 12,000 bells. You can also have Flick make you a statue of a scorpion if you bring him three scorpions. This statue can be sold for 24,000 bells.