I was graciously given permission to re-post this information by @youniqbeauty on Instagram.
This post highlights the layout of the LOTTE DUTY FREE Store in Myeongdong!
Here is a link to her account, you should definitely follow her account if you're into K-beauty! https://www.instagram.com/youniqbeauty/
Here's a link to Part 1: Sales and tips for shopping at road shops
As I have kinda sorta mentioned on my post about Dr. Jart and StyleNanda, and as savvy shoppers know, you have to shop at the Duty Free store for better prices on CERTAIN BRANDS.
For example, Belif is more expensive if you go to a store outside of the Duty Free. Even though it's a Korean brand, it's cheaper to buy it at Sephora or on Amazon. (Sorry, for the American perspective, but if you want to buy this great moisturizer and aren't from the US, I recommend you check the prices in your home country before coming to Korea, just to make sure!)
The other great thing about shopping Duty Free is that at Lotte Duty Free Stores, you get at least an additional 10% off for using a Visa card! (As you see below she mentions a specific type of Visa card, but it's actually for any credit/debit card with a Visa logo on it). Depending on the status level of your credit card and how much you're purchasing, you might also be able to save an even larger percentage!
However, my tip, which differs from hers (just because I live here and have seen the sale cycles), is if you are going to buy products from the typical "road shop" brands like Etude House, Innisfree, Missha, The Face Shop, Skin Food, etc., make sure you look out for their sale days and see if they correspond with your travel dates. Part 1: Sales and tips for shopping at road shops