Life In 19x19

I am looking for a 17 X 17 goban to play Tibetan Go and ancient Go.

I realize it is possible to vary the goban size with many computer programs but I am looking for a physical goban.

Any leads would be greatly appreciated. Thanks!

Make it yourself or get someone to custom make it for you.
It's not exactly something normal go players would buy so I don't think they would sell such commercially.

Alternatively, perhaps you might fly to Tibet and look around for it in some antique shops there.

Or perhaps you might take a cheap 19x19 board and paint over the lines of outer edge until you are left with a 17x17 board.