I am eager to see a wheeled car like that support an [old] mobile phone over and is cheaper than USD 30? Good for education. The "prototype" via Lego Mindstorms

I am eager to see a wheeled car like that support an [old] mobile phone over and is cheaper than USD 30? Good for education. The "prototype" via Lego Mindstorms is more expensive. I think much of the cost is a good motor now? There were startups trying to make this but I think they are closed [1]. [1] https://web.archive.org/web/20190104173241/http://www.simplebotics.com/2016/02/the-rise-and-fall-of-robot-startup-romotive.html https://web.archive.org/web/20190104173241/http://www.simple...