Me: “This serum is $9 cheaper here!” 🤩
Also me, 5 minutes later: “…oh, it’s the 30ml mini. And it’s a different version. And it’s shipping from the moon.”
Quick answer: Compare the same product first, then the price. Match the full name, size, version and pack (single vs duo vs set), the regional store, and the date you checked. Then compare delivered totals, not sticker prices.
I use this 5-point check before every comparison on this blog, including my Torriden serum check across 5 US shops on 6 October 2026.
NewJeans’ Hanni behind the scenes, for a quick serotonin break
Price comparison is a lot of squinting at tiny labels. Here’s NewJeans’ Hanni on an Armani beauty shoot, from NewJeans’ own channel, as a reward:
Match the product before the price
A familiar brand name is not enough. Not even close.
- Product: the full product name, and the product code if there is one.
- Size: 50ml vs 50ml. Not 50ml vs 30ml, bestie.
- Pack: single, duo, set, mini or promo bundle are all different deals.
- Market: the regional store and currency for where it’s shipping.
- Time: when you checked. Sale prices and stock change fast.
A listed price is not a delivered total
The sticker is just the opening act.
Shipping, checkout discounts, local taxes, customs and carrier fees can all change the winner. I keep the listed price separate from those extra costs, and if I can’t match a listing exactly, I leave it out instead of guessing. Full method: how I check prices.
Math giving you a headache? Plug your cart into my door-charge calculator and let it do the crying for you.
See it in action
- Torriden Dive-In price comparison: one bottle, 5 US shops, single vs duo.
- K-beauty free shipping math: when a bigger cart is a trap.
- Stylevana vs YesStyle vs Olive Young: which shop for which cart.
- Olive Young Seoul vs US price: real shelf tags from Seoul.
Practice on one product
Pick one bottle and open it in every shop. Same size, same version, then compare the final totals.
- Torriden DIVE-IN Low Molecular Hyaluronic Acid Serum (50ml): Amazon · iHerb (10% off with code PNF305) · Stylevana (10% off with SV15SEOULBD, or 15% off $59+ when logged in) · Sephora
- Anua Niacinamide 10% + TXA 4% Serum (30ml): Amazon · iHerb (10% off with code PNF305) · Stylevana (10% off with SV15SEOULBD, or 15% off $59+ when logged in) · Ulta
Discounts depend on your cart and each store’s current terms, so compare the final checkout line.
I don’t claim I bought or tested a product unless a post says so. Updated: 7 November 2026.
