OrigamiUSA has the 10” kami, white on one side at this link https://origamiusa.org/catalog/products/kami-assorted-10
It is 100 sheets in a pack, 20 different colors, so 5 sheets of each color. I think it is actually 24 or 25 cm, which is a bit short of 10” though, if that matters to you. The actual description when you click on the product is: “Standard origami paper, 20 assorted bright colors; colored on one side, white on the other. 10” squares 100 sheets” Janet > I think there used to be 10-inch paper, sold in packs of 100 sheets, with > many different colors on one side, and white on the other side. > > Zack Brown
