As vaccinations continue across the U.S., some companies are offering financial incentives to encourage their workers to get the shots.

Instacart Inc., the grocery delivery service, announced Thursday that it would provide a $25 stipend for workers who get the COVID-19 vaccine. It joins others, including Trader Joe’s and Dollar General, which plan to pay workers extra if they get vaccinated.

San Francisco-based Instacart has nearly doubled its mostly gig workforce to about 500,000 to meet a surge in demand for online grocery shopping since the pandemic erupted in the U.S. last spring.

Grocery chain Trader Joe’s, which has more than 50,000 employees, said Thursday it will give employees two hours of pay per dose for getting the vaccine. The Monrovia, California-based company said it will also shift around schedules to make sure employees have time to get vaccinated.

Dollar General said Wednesday it will give employees the equivalent of four hours of pay if they get the vaccine.