Shop

Not to be confused with The Shop, a floor in Greed mode.

A shop is a room that sells various items in exchange for pennies. Shops require a key to open, unless Isaac holds Store Key, and appear in every Chapter prior to Womb or including The Womb if Isaac holds Silver Dollar. Additionally, a single Shop always spawns adjacent to the ??? starting room.

Only one shop will ever spawn on a floor at a given time, even while under the effect of Curse of the Labyrinth.

Shops on the first floor of any run do not require a key to open.

Shops have a chance of being replaced by a miniboss room containing Greed or Super Greed once entered. Once either miniboss has been defeated in a Shop, it will not appear in another for the rest of the run.

If Greed or Super Greed are fought in a Secret Room, they will not appear in the Shop if defeated.
Greed will always spawn first, followed by Super Greed.

Rib of Greed prevents both Greed and Super Greed from appearing in Shops while held.

Greed Mode

In Greed Mode, Shops are twice as wide as usual and do not require a key to enter. They always contain a key, a red heart, an item from the Greed Mode shop pool, an item from the Greed Mode boss pool, and two random pickups, trinkets, or items from the Greed Mode treasure room pool. A new item will spawn after an item is purchased, as if Isaac is under the effect of Restock.

Shops will never be replaced by Greed or Super Greed in Greed Mode.

Merchandise

The Shop almost always contains at least two consumables and a Donation Machine. Shops will contain at the maximum six items depending on their level.

Steam Sale will halve all prices in the shop, including discounted ones.
- Two Steam Sales will make every item free, which can be combined with Restock to allow infinite purchasing power. This also holds true in Greed Mode.
Any purchasable item has a chance to be discounted, which will cut its price in half.
- Discounted items have red price tags instead of white price tags.
- If a discount leaves the price of an item at a number that is not an integer, pedestal items will round their price down while pickups will round their price up.
Shops can sell red hearts for 3¢. They can also sell soul hearts, bombs, keys, batteries, pills, and tarot cards for 5¢ each, and sacks for 7¢ .
After reaching Lv. 1, the Shop will start selling pedestal items for 15¢. A list of items that can be available for sale can be found here.
There is a 50% chance for the Donation Machine that spawns in the Shop to be replaced by a Restock Machine. This was removed in Repentance.

Levels

Shops start at Lv. 0 and can be upgraded through the Donation Machine, which can be found in Shops and sometimes in arcades, vaults, black markets, and rare room layouts. Each level increases the amount of items for sale and visually fills the walls of the Shop.

Normal mode will always feature the highest unlocked level of shop. In hard mode, any level of shop that has been unlocked can appear.

Level	Pennies donated	Shop stock
0	0	2 consumables available for sale
1	20	2 consumables and 1 pedestal item available for sale
2	100	3 consumables and 1 pedestal item available for sale
3	200	3–4 consumables and 1–2 pedestal items available for sale Five items total
4	600	4–5 consumables and 1–2 pedestal items available for sale Six items total

Rare variants

There is a small chance for the Shop to be replaced by one of its two rare variants:

The two pennies are lucky pennies.
This variant has a small chance to appear in any level of store upgrades.

Notes

The Shop can also be accessed through the usage of IX - The Hermit, Curse of the Maze, Dad's Key, a secret room, or Store Key.
The Shop has a door that is identical to a Library as well as an identical symbol on the minimap. The Shop can never spawn adjacent to the starting room (with the exception of the first floor), meaning that any one-key door that spawns adjacent to the spawn room is a Library and not a Shop.
- Store Key will not open Library doors, so be wary if you have a low amount of keys.
Using a Credit Card in the shop will make everything for sale free, spawning item pedestals and removing all listed prices.
- Restock only replenishes items that are bought for a listed price; therefore, Credit Card cannot be used to restock the Shop.
Holding Store Credit will reduce the price of all items to 0¢. It will be consumed once an item is purchased. Unlike the Credit Card, Restock will restock the bought item.
- If the Store Credit effect is gained through the effects of Error, it will not be consumed upon making a purchase; this can be combined with Restock to infinitely purchase items.
Using a Rune of Jera rune creates a free copy of all pickups, even if they haven't been purchased.
- Diplopia acts identically with the exception of duplicating pedestal items as well.
The dead shopkeeper that spawns in the Shop can be bombed for potential rewards.
- Shopkeepers can spawn Steam Sale, Head of the Keeper, or Coupon at a 1% chance, drop two pennies, or drop nothing.
- Special shopkeepers can replace the regular shopkeeper at a chance, which drop better rewards.
  - Special shopkeepers can spawn nothing, Greed, any of the six penny trinkets, or a nickel.
- If II - The High Priestess is used in a room with a dead shopkeeper, the foot will target and destroy the dead shopkeeper.
If enough items are purchased to empty the Shop item pool (excluding the effects of Chaos), shop items will begin to draw from the Treasure Room pool.
- Breakfast will spawn once the Treasure Room item pool is depleted.
A total of 9 Shops maximum can be entered during a normal run — two in Basement, two in Caves, two in Depths, two in Womb with the Silver Dollar, and one in ???.
- This is increased to 10 if Isaac additionally holds Holy Crown or Wicked Crown in Cathedral or Sheol respectively, and Isaac can theoretically encounter many more shops with Red Key.
Items will increase in price the more bought with Restock until maxing out at 99 cents.