Nikola (NKLA) opened up reservations for its hydrogen-electric Badger pickup truck on Monday to the tune of $5,000 per reservation.

The electric truck newcomer’s founder Trevor Milton predicted that the Badger will be sold out fast and interested buyers should act quickly to make their reservation.

Nikola has come under fire for not unveiling a prototype of the Badger to date. Only renderings have been revealed by the company, and an announcement of a partnership with an OEM to produce the truck is still looming.

The $5,000 reservation fee is fully refundable by the company. Milton was also quick to point on Twitter that all reservation monies will be used as deposits for the truck and not to “fund the company’s development”, which some Twitter users took as a shot at Tesla. Tesla has a $100 fully refundable reservation fee and a seven-day return policy.

Nikola has seen its stock price pop over recent weeks as interest in the automaker has grown. The rival to Tesla, Ford, GM, and Rivian has drawn interest as it promises to offer a pickup truck that outpaces its competition.

Nikola also has its fair share of critics as a new entrant into the auto market. The company’s founder Trevor Milton has spoken to the naysayers, saying on Twitter that he has “a lot to prove” and to “give it a year to see the great progress.”

The Badger pickup truck will debut on Dec. 4, during what the company is calling #nikolaworld2020.

It is expected to come with a $60,000 to $90,000 price tag and is anticipated to be delivered in 2022.

Nikola stock was trading at $68.26 share at 12:04 p.m. EDT,  up $4.71 from 7.41%.