I'm not sure what good can come from this, but Throwflame is selling its drone flamethrower attachment for $1,499. All I know is I definitely don't want any of my neighbors playing with this..
Why would you genuinely need such a thing? Well, there was that one example where a flamethrower drone was used to clear power lines in China... and the company suggests it can be used for controlled grass burns, and to destroy wasp nests, as a couple examples.
Via: The Verge