Store

Stores can be found at designated beacons or in events. They offer goods and services in exchange for scrap.

Stores always sell limited quantities of Fuel, Missiles, and Drone parts. While the amount of resources offered for sale varies randomly, they always cost 3 scrap per fuel, 6 scrap per missile, and 8 scrap per drone part. Fuel stock varies between 3 and 7; missile stock between 2 and 6; and drone part stock between 2 and 4.

Stores also sell hull repairs, with the price varying depending on sector progression. Repairing 1 hull point of damage costs 2 scrap in sectors 1-3, 3 scrap in sectors 4-6, and 4 scrap in sectors 7-8.

Stores also sell items, which can be systems, weapons, drones, crew, or augmentations. Each store sells 2-4 categories of items. Each category contains three random items of that type (for example, three random weapons).

The number of guaranteed stores is determined by the sector type. Due to issues with how sectors are generated, about 0.8% of Uncharted Nebulas have no stores at all. ^[1]

Number of stores by sectors
	Civilian (Starting Sector)	Civilian, Engi	Zoltan, Rock, Abandoned	Mantis, Pirate, Rebel	Uncharted Nebula	Slug	Hidden Crystal Worlds	The Last Stand
Stores	1-2	2-3	2	1-2	0-1	0-1	2-3	1
Nebula Stores	-	-	-	-	1	2	-	-

↑ Uncharted Nebulas are even worse than you think: ftlgame

With Advanced Edition content off, there is a bug that causes some item slots to be empty. For example, a store might sell only two weapons instead of three.

Systems[]

Stores may sell three random systems. Systems are installed on your ship in a predetermined location. If you buy a teleporter, it will always have two slots, not four.

Filling all your system slots will not prevent stores from selling systems, even though you can't buy them (except for medical systems, which replace your current one). When a store is selling systems, the selection is mostly random, but is governed by a few special rules:

Stores cannot sell a system you already own
Shields are guaranteed if you don't have them
A medical system is guaranteed if you don't have one
A drone system is guaranteed if the store also sells drones

The systems that can be sold are the following:

Purchasable Systems
System		Cost
	Shields	125
	Medbay ^[1]	50
	Clone Bay ^[1]^[2]	50
	Drone Control	75 ^[3] 85 ^[3]
	Hacking ^[2]	80
	Mind Control ^[2]	75
	Crew Teleporter	90
	Cloaking	150
	Sensors	40
	Door System	60
	Backup Battery ^[2]	35

↑ ^1.0 ^1.1 Buying a medical system will replace whichever one you currently have (medbay becomes a clonebay and vice versa). System levels will be preserved when switching.
↑ ^2.0 ^2.1 ^2.2 ^2.3 Advanced Edition Content.
↑ ^3.0 ^3.1 The cost of buying Drone Control depends on which Drone it's paired with at the time of purchase. Drone Control + System Repair Drone costs 75 . Drone Control + Combat Drone Mark I / Defense Drone Mark I costs 85 .

Weapons[]

Stores may sell three random weapons. A store will never sell duplicate weapons, so it's impossible (for example) to buy three Burst Laser 2 weapons at one store! However, stores can sell a weapon that you already own.

Weapons have different rarity values. For example, a Flak 1 is 5 times more common than a Glaive Beam. Crystal weapons can only be bought or found in the secret sector, except for the Lockdown Bomb, which can also be found in Rock sectors.

Drones[]

Stores may sell three random Drone schematics. If a store is selling drones, it is guaranteed to also sell a drone system.

Stores will never sell duplicate drones, but they can sell a drone you already own.

Drones have different rarity values. For example, a System Repair Drone is 5 times more common than a Combat Drone Mark II.

Augmentations[]

Stores may sell three random Augmentations. Augmentations have different rarity values. For example, a Scrap Recovery Arm is 2.5 times more common than a Weapon Pre-igniter.

Stores will never sell duplicate augmentations, but they can sell an augmentation you already own (even if it doesn't stack).

Racial augmentations, such as Slug Repair Gel, cannot be bought or found. Some of them can be found in specific events.