If you’re hoping to convince a friend or family member to buy a Tesla, you better act fast, since Tesla’s referral program is set to end at the end of January.

Tesla CEO Elon Musk announced on Twitter that its referral program, which comes with 6 months of free supercharging, is set to end.

The referral program also includes other perks, like a laser-etched photo of the owner being launched in space, a black wall connector and a miniature Model S for the kids. Tesla decided to end the referral program, since it is adding too much cost to its cars, especially the Model 3.