For me, personally, having something I have to fold up and all that kind of defeats the purpose. But that is just me. There used to be the cutest quilt shop in Henderson, NV that I went to a few times. It was owned by a young gal that had a little boy. She had her dad build the cutest picket fence with a gate in the corner for her son. It was tall enough to keep him in, but short enough that she could keep an eye on him from anywhere in the store. The children of her shoppers could also play in it.
I used to do daycare when I was much younger. The kids play area was in the on one side and my sewing machine table was in a corner. I got a lot done while the kids were playing. Often I had an audience of little girls. Of course I had to keep the sharp stuff up and away, but that was easy enough.