Where to buy?!

I’m so sorry if this has been asked before but I left Seoul not even 2 weeks ago and only found out those lil characters I saw everywhere, the cutest lil guys were called, Kakao friends <3 I’m so glad I got a plush pendant of Choonsik holding Pompompurin as well as Joseon x Choonsik sunscreen. BUT OMG IM SO SAD I DISCOVER MORE ABOUT THEM WHEN I WAS THERE. Do I wait till another trip to Seoul?? Or do I buy online? Where would I buy online in the U.S.?!