My friends like K-Pop. I don't really know what to give them? Or where to buy something like that?

I live in Texas. I have two friends that love K-Pop. I try to learn what they like but due to me not wanting to give them hints on christmas presents I can't exactly write down what they like. One of my friends loves B.A.P and my other friend likes Big Bang, Beast, and JYJ (??). I really don't want to pay more than 25$ in total (including shipping) due to low income but I do want to give them a present they will love. My 1st friend doesn't have anything K-Pop except for some socks but I'm not sure about my second friend although I know she has a pillow with a K-Pop singer's face on it.

Can a K-Pop lover help me? Thank you!