If you are talking about Ceramics as the mould poured stuff. No, that mix of ball clay and talc, was never meant for practical use, even if fired to cone 02.
It was originally a 1920's or so Art Clay body.
With time the bonding breaks down and the body powders.In our climate it would be in about a year or so.
If you are talking about Potters who work with Stoneware, then you have to find someone who can build by hand for rectangles and squares or other shapes that are not wheel thrown.
Cost depends on how much the person values their time.
Plus, it really depends on your own personal taste, if you are someone who really pays attention to pots, then you need the work of an individual, if you are more into the tree, then Lotus International with the standardized [ classical ] work off of the hump mould out of China is more for you.
I fall into the Lotus International stuff.
Good Evening.
Anthony