Last winter, Musk promised the world a flamethrower if we bought 50,000 The Boring Company hats. The hats sold, the flamethrower went up online for the low price of $500, plus tax, and The Boring Company promptly sold $5 million worth of them.
Flamethrowers are actually unregulated in almost every state because, according to the Washington Post, "they aren't considered a 'firearm,' which -- unlike a flamethrower -- is defined by its ability to expel a projectile using an explosive." The only states that do ban them outright are California and Maryland, but these probably don't fit that definition anyway as they don't shoot a flammable liquid and the flame is pretty short. They're really more like giant, highly impractical propane lighters.