Kpop album prices

Hey guys, I just have a few questions about K-Pop albums that are distributed in local stores over in Korea.
Normally how much are k-pop albums overseas in Korea compared to online shopping?
For example: How much is an Mini Album that are distributed by SM entertainment? Does the price vary by artists? How much are full albums etc.

Reason why I'm asking this is because my friends are heading to Seoul soon and I'm just gonna ask them to bring me back a few.. hehehe. I live in the States, so lets use USD to compare!

So any input would be awesome!

Thanks in advance guys!