Is there a retailer out there that makes sells magnetic wall-boards (preferably one that sells in North America) like the ones in this video or this one? I may have use of one and wanted to see if a nice one could be had for a reasonable price before trying to make my own.
Kiseido used to sell one, I think. They don't have it now, though.
Yellow Mountain has a magnetic rollup board( http://www.ymimports.com/p-232-deluxe-go-game-roll-up-magnetic-portable-set.aspx) that could do the same, if combined with a metallic surface.