Previous floss discussion
Last time it was posted at this price in March 2016
Just spotted this at Woolworths Burwood Westfield NSW.
I would imagine this is Nationwide because it's listed on Woolworths online as well.
Personally I find there's a slight difference between the 100m and 50m, with the 50m one being slightly more grippy.
For anyone that is visiting Asia (e.g. Malaysia, Singapore, Taiwan, Hong Kong, China), I personally would actually recommend Watson's own brand of dental floss which is the best I've used so far. Watson's is similar to Priceline. I haven't found an equivalent in Australia yet. It's also actually slightly cheaper (using the Malaysia retail price of RM7.50 for 50m).
+1 for efforts, will try Watson next time, it's everywhere there