In indonesia, no one makes sour bamboo shoots.
In bangkok you can find in any market.
In the US it comes in a can.
Our friend Mr. Fuen phengsatorn from the Ministry of foreign Affairs, Thailand told me that if you eat sour bamboo you will not contract tuderculosis.
He did not provide any medical evidence to support this claim, but since we like sour bamboo anyway, we have nothing to lose