Shops are special rooms which can appear in any level of the game, save for side areas. There is never more than a single shop in a level.
A shop always contains at least two items and is always operated by a Shopkeeper.
A shop contains some destructible cosmetic objects which serve no purpose: a sign, a decorative helmet and armor, a counter, and item stands.
Funding the shop
As the player buys items from the shop, shops in later floors will contain extra items, up to five items total. These extra items will have better stats an a higher price.
Stealing items
Fighting the Shopkeeper
Shopkeeper's Stash
There has to be something good in it!
On some levels, a Shopkeeper's Stash is generated in the shop's back room, along with a friendly Fox Thief NPC. Interacting with the Fox Thief NPC will accept the quest, causing the NPC to disappear and reappear during the next bonfire intermission.
Using a Stash within the inventory opens it and reveals a normal item. However, this newly revealed item cannot be given to the Fox Thief NPC. This item is likely to be God Cursed.
Delivering the unopened Stash to the Thief rewards the player with a large amount of coins (up to multiple hundreds).