Tesla knocked $2,000 off the prices of three of its five models in the United States late Friday, another sign of the challenges facing the electric vehicle maker led by billionaire Elon Musk.

The company cut the prices of the Model Y, a small SUV which is Tesla’s most popular model and the top-selling electric vehicle in the U.S., and also of the Models X and S, its older and more expensive models. Prices for the Model 3 sedan and the Cybertruck stayed the same.

The cuts reduced the starting price for a Model Y to $42,990 and to $72,990 for a Model S and $77,990 for a Model X.

The move came the day after Tesla’s stock tumbled below $150 per share, eliminating all gains made over the past year. The Austin, Texas, company’s stock price has dropped about 40% so far this year amid falling sales and increased competition. Discounted sticker prices are a way to try to entice more car buyers.