Quadrilogy

Is it still possible to obtain the Rabbi's "Rabi'i'Logia" in physical copies? (I know it has a professional name, but I liked the one I made up better)
Also, is there any point in reading the Quartet if I've already read the trilogy and the other three books by the rabbi published by Yedioth? Is there anything else there or is it roughly the same?
The question is based on the assumption that the rabbi would be honest enough to tell me that there is no need if this is truly the case, even if the rabbi has a financial interest in the matter.
I really enjoy the rabbi's books, but I don't have much time to read, only a few hours a week, hence the question. Thank you very much.