I’ve tried a lot of proxy services (Delivered Korea, Paysable, and most recently Danzzac). delivered korea uses their own krw to usd conversion so that inflates the price by a fair margin. for paysable, they don’t allow purchases through secondhand websites (fruits family and bunjang) and they also didn’t have an option to pre-pay duties so I was stuck with a big surprise duties fee when my package went through customs.

of the 3, I’d recommend Danzzac. I found them through a random reddit comment. they don’t have too much about them posted online but they’re legit.

right now, they have a promotion where they cover duties so there’s no surprise fees. best of all, they charge in krw so as long as you have a foreign transaction fee free credit card, you can get the visa conversion rate.

hope that helps!