There are a number of chess variants and other games played on a 10 by 10 chessboard (as opposed to the usual 8 by 8). There are plenty of places where you can buy a 10x10 chessboard, and of course you can just draw one, but I wanted a middle solution that wasn't too expensive but was a little bit durable as well.
I settled on buying a couple of cheap chess sets and making a new board out of the two included boards. I wanted to keep the center fold intact, as well as maintaining the border. This is doable, as seen here.
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The fold and surrounding squares are cut out of both boards, and each is cut to five squares long. The first board also has the edges cut off, and the remaining two 8x2 sections are cut into four 8x4 sections. The second board has its two edge-including 8x3 sections cut into four corner-including 4x3 sections. Everything should be cut as sharply and cleanly as possible, so that they can be taped back together.
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The two 5x2 fold sections are taped back together to make the center of the new board and turned sideways (the new board folds lengthwise). The edges from the first board and the corners from the second board make up the rest of the new board. I used clear packing tape to attach the pieces to each other.
There are four leftover pieces - two 1x8 edges with corners from the first board and the two 2x3 folding pieces. These can be assembled into a folding 4x8 board with the center 2x2 square missing, but I'm not sure if there's any use for such a board. Another option would be cutting two squares out from each edge, which would give you a folding 4x6 board and a 2x2 board with borders on only two sides.