If you have bought products like CE Ferulic or Pumpkin Mask, then leave a review under the product you purchased, and you will get a 10% discount on any other product you buy, even if other specials apply. If purchasing online then mention the review, and you will receive a credit.
Also if purchasing online for the Hawaiian getaway you can save 25% of the product value as applied to your trip. So a purchase of $100 would give you a $25 discount on the vacation. There is no limit who can purchase for your vacation. Also the vacation purchase would save on your guest tax which is another 14%.