Inquiry about website.

I noticed something pretty strange, when I´m visit https://store.fakku.net I´m unable to see all physical manga and doujins so to buy a book I must search it in https://www.fakku.net/comics.
In Store.fakku I only can see Apparel, Figures, Skateboards, Other.
I don´t know if it happens due a bug, error or the physical books only are shown through normal fakku page or if the website have any restriction with my country.
I hope you guys can clear my inquiry and I hope you are well.

https://www.fakku.net/books

Thank you! but I unable to see which physical books are out of print.

https://www.fakku.net/forums/books/list-of-titles#4781757

A while ago after the store has been merged to the main site, the books that are currently out of stock will have their paperback option being disabled when you try to add them to the cart. But given that the system has changed a lot over the time, I can't say if this is still the case or not.