Admin auctions
Overview
Admin auctions are items/inventories listed not by players but as admins, in the name of the server. They behave just like normal listings, but can't expire unless removed by admins, and have configurable quantity (either a set value or straight up infinity).
Usage
Take an item in your hand and type /ah adminsell <price>. You can then select the quantity available for players to buy.
Management
You can take down the item, edit its price or its quantity at any time using the listing management menu (Shift+Click the item in the AH menu)