Must buy from The Face Shop, Etude House, Missha, Tony Moly etc...?

A friend just got back from Korea and I ask her to buy me Missha BB creams. I got the M Perfect and the M Signature ones. It's so much cheaper compared to the prices on their website. I thought it was more than US$40 since that's the price I saw online, but, it turns out, it's around $30 or less. Also look into the brand Hanskin. A Korean friend recommended it. she said it's a popular brand in Korea.