New York (CNN Business) Time is running out to buy the cheapest versions of the Tesla Model S and Model X luxury cars.

In a tweet, CEO Elon Musk said Tesla would no longer take orders for the 75D versions of the two cars starting Monday. The 75D versions have less powerful batteries than the more expensive versions, so they can't go as far.

The 75D version of the Model S sedan has a starting price of $76,000, and can go 259 miles on a single charge. That's $18,000, and 76 miles less than the 100D version.

Model X 75D has a starting price of $82,000 and can travel 237 miles. That's $15,000 and 58 miles less than the 100D.

An even more expensive version of each car can travel longer distances on a single charge and accelerates faster. Various options, including autopilot, can add thousands of dollars to the costs of the vehicles.

Read More