Robinson's 15% + 5% sale applies in addition to the already discounted health supplements and I saw quite a big crowd buying today (as precautions against SARS?).
For Brands' Sesamin with Celery Seed Extract, there seem to be a slight pricing discrepancy too. Elsewhere (e.g. NTUC pharmacy), the price is $30 but at Robinson, the list price is $20 and after all the discounts, members need to pay only ~$13.70 for one bottle of 60 tablets.