Elon Musk’s overpriced ‘Flamethrower’ sold out in less than a week

Tesla’s Musk sells $10 million in flamethrowers in four days.

The Boring Company Flamethrower (The Boring Company)

Silicon Valley billionaire Elon Musk has closed orders for his latest novelty product, flamethrower, after selling 20,000 units at $500 a piece.

"Guaranteed to liven up any party!" was Musk's tagline for a sale which raised $10 million for his high-speed tunnel venture The Boring Company.

The man behind electric carmaker Tesla and rocket company SpaceX had earlier sold 50,000 Boring Company hats in similar fashion.

The latest impromptu fundraising scheme comes at a time when financial analysts and investors in Tesla are wondering if Musk will have to seek billions more in funding for the electric carmaker as it struggles to meet promises on production.

Small detail, but each one will come with a serial number from 1 to 20,000 pic.twitter.com/ZBYEYO6zqu

— Elon Musk (@elonmusk) February 1, 2018

"When the zombie apocalypse happens, you'll be glad you bought a flamethrower," he tweeted last Saturday. "Works against hordes of the undead or your money back!"

Each flamethrower, he said on Thursday, would come with a free fire extinguisher and buyers need to agree to certain conditions before getting the device in spring.

"Buy an overpriced Boring Company fire extinguisher! You can definitely buy one for less elsewhere, but this one comes with a cool sticker and the button is conveniently riiiight above," says the company on its website.