User blog comment:Pualover/Overlord Power Level/@comment-26902975-20151113141402/@comment-78.226.26.9-20160620215539

Don't have much of them ? IT's Ainz we are talking about, the are high chances that he have bunch of them (or why would he have use one of them during the Kingdom army massacre just to not look "uncool" ?). He is the type "collectionner" which held a bunch of time each items and it's very likely that this kind of usfull item are stocked in quantity (yet not obtainable again, as you said)