Thumb Score: +14 Same-day/instacart offerings at Costco are substantially marked up, but I found this combination of promos that yielded a price lower than in-store. This uses $15 off $50 Costco same-day promo code (SUMMERSAMEDAY24, applied during checkout) and a $10 off $45 Nestle promo (automatically applied). Each case of S.Pellegrino water is slightly over $25 in the NYC area, so purchasing two cases satisfies the requirements for both of the promos.