I have never seen it being sold at the NTUC branch that I usually go to. I notice that depending on where an NTUC store is located it carries different line of prducts. For example some branches don't have organic produce. You can only find them in the more upper scale branches. At some of these branches you will also find organic eggs, celery, carrots, ...& Japanese produce.
NTUC is also not the cheapest. Recently they increased the organic eggs from $9.95 to $10.50. While at a non-NTUC healthstore the same eggs are still selling for the same old price of $9.95