American Go E-Journal

Portable Go Board? “What kind of goban are the kids in your Chicago tournament story (Chicago Kids Compete in First Tourney 5/21 EJ) using?” writes Chris Uzal. “Who makes it? And how did they make stones for it? It looks perfect. Right size for a backpack and a place for your fingers if you have to move the board. We need more of these in the United States and Europe. The traditional board size is due for a break in tradition.”
Small magnetic sets like that are readily available in the US.  Yellow Mountain and Yutopian both carry them.