iHerb is celebrating November 11th, which is the single’s day in China with a special promotion.
Starting from November 9th at 8 A.M. PST to November 13th at 10 A.M. PST, iHerb is offering a special 11% off coupon code for any order over $40 USD (AU $54 approx.)
Edit: Promotion will start 10 November 3am Sydney time (AEST)
Good find, I think it's ~15.25% off if you combine with "BUY123"