I have been slowly collecting over the years I do not have a ton of albums yet but I am slowly working on it. My most rare and most treasured albums are definitely the SNSD Gee Japanese Pink Version Limited Edition Single, SNSD Oh Album, BigBang's For the World and Yang Pa's 2001 Perfume Album. I have about 30 K-Pop/J-Pop collectable albums.
Bonus: Mika Nakashima's Film Lotus Sealed in Plastic Wrap
These are just the official scans of the covers but I can take photos when I get home of mine if need be but I did pack some of them last night for safe moving, which is why I thought of this topic.