COSRX via Amazon has 3.38-Oz COSRX Snail 96 Mucin Power Essence + Free Additional Benefit Item: 0.67-Oz COSRX Retinol for $11.69 (see below for details). Shipping is free w/ Prime or on $35+.
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Directions: Add both to cart - in cart click save now with Subscribe & Save & checkout: