Chevy Spark: https://www.chevrolet.com/cars/spark

Nissan Versa at $15.5k: https://www.nissanusa.com/vehicles/cars/versa-sedan.html

Kia Rio and Hyundai Accent aren't too far off at $16.5k: https://www.kia.com/us/en/rio

https://www.hyundaiusa.com/us/en/vehicles/accent