If you’re in the market for a Tesla Model S 75D or Model X 75D, you’re better act fast as CEO Elon Musk has revealed both will be going away soon.

In a tweet, the outspoken executive said the company will stop taking orders for the models beginning on January 14th. He went on to urge customers interested in the vehicles to place their orders by Sunday night.

The news has caused somewhat of a panic as the 75D versions are most affordable Model S and Model X vehicles that Tesla currently makes. The sedan starts at $76,000 and can accelerate from 0-60 mph (0-96 km/h) in 4.2 seconds, before hitting a top speed of 140 mph (225 km/h). The Model S 75D can also travel approximately 259 miles (416 km) on a single charge.

The Model X 75D is slightly more expensive as it starts at $82,000. The crossover is also a tad slower as the dash to 60 mph (96 km/h) takes 4.9 seconds and the top speed is a more modest 130 mph (209 km/h). Unsurprisingly, the range is also less impressive than the sedan as it can only travel around 237 miles (381 km/h) before needing to find a charger.

The news might not be entirely all bad as Engadget noticed Musk replied to someone asking if Tesla was moving away naming its model variants after battery capacity. Musk said yes and this seems to confirm the Model S and Model X will adopt a new nomenclature similar to the one used on the Model 3. Instead of referring to battery capacity, the Model 3 has three variants known as “Mid Range Battery,” “Long Range Battery” and “Performance.”