Why would you post this in an AK thread? !?! I came in here thinking I was safe and somehow I found something I want!!! And I don't own an AKSwitching subjects slightly to the AR world.
Best price I could find today on 40rd Magpul mags -
https://www.deguns.net/pmag-40rd-MAG233-BLK-873750009698-p/mag233-blk.htm