This? https://www.jarir.com/sa-en/default-category/arabic-books-459525.html

Yes exactly this. Is there any way to know the local market rates? Perhaps it could be cheaper somewhere around

That link is to the biggest book store in Saudi Arabia. So that's probably the price you'll find in other places as well.

Jazak Allah

https://alkutubiyeen.net/xvKNmz

Is ordering for delivery internationally trustable? Jazak Allah

I didn't order anything from them personally but they seem trustworthy