The Dungeon Shop is located on every floor following a boss battle. It only accepts Dungeon Shards as currency.
|Bug Alert: If you want to leave the Dungeon after visiting a boss or shop level, exit to the next combat level first, i.e. one with enemies. Otherwise your dungeon progress may be reset back to level 1 when you return.|
There is a special storage chest in the Dungeon Shop that shares the same inventory regardless of what Dungeon Shop floor you are on, as well as with one of the chests outside next to Hash. This makes it easier to offload excess items to free up space.