Looking for POD supplier for Rigid Art Boards

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Tourist
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I want to sell art but not canvas and not posters. I see art on Redbubble that is called "art boards" and they stand up on their own. It says they are "watercolor textured 4-ply board". I can't find a print on demand supplier for these. I have looked thru the product catalogs of Printify, Printful, Gooten, and Art of Where. 
I know this is a long shot but this is exactly the style of art I want to make. Anyone know of a supplier? 
Thanks.

Redbubble art board example

 

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Tourist
7 1 1

It looks like Prodigi might have what I need -- gallery boards. But my shop is in the U.S. and they are in the U.K.   I wonder if they can add panels to their U.S. manufacturing locations?
Gallery Boards from Prodigi 

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