I bought mine from the Japanese department store here,but they do not carry it anymore.It was not an endgrain but held up well without warping & was easy on the knives.
Most of my cutting these days are on a boardsmith mohagany endgrain.I use a bamboo board for protiens.I use Howards Butcher Block.Some say food grade mineral oil is enough(never use food oil eg. olive oil board will become rancid).Howards has food grade mineral oil wt. beeswax & carnaba helps with water resistant & rejuvenates the wood.