Some vendors call them walkers -- but I think of those as the aluminum things the Old Ladies danced with in The Producers. I prefer the word rollator, which I'll bet was a made-up trademark that wasn't properly protected, so it lost the capital letter and some manufacturer lost the right to exclusive use.
My first one (see this blog three years ago) was a full-size affair that kept bumping into door frames and scratching furniture. So it's been limited to carrying in groceries.

So anyway, here's what could yield you, as Dr. Johnson wrote, riches beyond the fondest dreams of avarice. Okay -- all those rollator ads list exactly the same set of advantages:
*padded seat
*removable basket
*brakes
* etc.
But -- here's a closeup of my outfitted little companion:
*the flashlight is for times when one forgets to leave the lights on in the next room and is afraid of tripping
*the timer reminds one that those eggs will be hard-boiled in twenty minutes (see blog two years ago).
I'm not entirely joking. Some manufacturer could sweep the market with a deluxe fully-equipped rollator. All that's lacking is a niche for the smartphone.
You're welcome to the idea -- now somebody, please do something about this.