i’ve been trying to find mangas but its either not there or very expensive
You can buy manga and light novels from
https://www.bookdepository.com/
Worldwide free shipping
I bought a light novel from them. I recommend this website cuz they sell brand new manga.
Vijithayapa had a very limited collection when I last checked but the best way in my opnion is to order online from a website that offers international shipping like book depository or Amazon.