What are your favorite ways to save money on health and beauty products online?

I regularly shop for skincare, haircare, wellness, and beauty products online, but prices can vary a lot between stores. How do you find the best deals on health and beauty items? Do you wait for seasonal sales, subscribe to brand newsletters, or use coupon websites? I've recently been checking ReeCoupons for promo codes and discounts before placing orders. What are your favorite tips for saving money while still buying quality health and beauty products?