Fallout/Items

Listed below are the various types of items you will be able to find in Fallout.

Gadgets

Item	Selling price	Use	First seen
Rope	$25	In Vault 15, you will need it to descend down the elevator shafts. In the Glow, you'll need to attach the rope to the beam and descend down the crater.	Shady Sands has one in one of the houses in the farm. You can also buy one from Seth.
Tool	$200	Use it whenever you are repairing things to get an increase of 25% to the 'Repair' skill.	You start out with one if you have enough repair skill. Killian has one in his store.
Lockpicks	$150	Use it whenever you are picking conventional locks for an increase to the 'Lockpick' skill.	You start out with them, or you can get them from the fridge in the Raiders base.
Electronic Lockpicks	$375	Use it whenever you are picking electronic locks for an increase in the 'Lockpick' skill.	You must give the necklace that Hightower owns to Loxley. He'll send you to Jasmine, who will give you a set of electronic lockpicks.
Radio	$350	Use it to draw off the mutants in the military base, and it can also be used to remotely toggle the computer in the base.	I traded some caps and flares for it from Lars at Junktown.
Flares	$35	Twist the cap and drop the flare for an increase in brightness in an area. Not too great.	You start out with them.
Dynamite	$500	Set the timer and the explosives will blow. Good for destroying forcefields, disabling locks on locked doors, and killing immobile foes (i.e, Master).	Vault 15 lockers, third floor
Plastic Explosives	$850	Same as Dynamite, but a bit more powerful.	Tyne sells it. He is a merchant in Adytum; to get to his store, head on to the left and enter the small shack and descend down the ladder. Or if you've visited the Military Base, some pieces are in a locker in the fourth floor.
First Aid Kit	$200	Increases 'First Aid' skill if you use this item.	You start out with one.
Doctor's Bag	$300	Increases 'Doctor' skill if you use this item.	There is one in Razlo's bookcase.
Motion Sensor for Pip-Boy	$800	Lets you see all of the critters on the Pip-Boy automap.	Random encounter (police box) or buy from the Hub.
Geiger Counter	$650	Lets you see how much radiation is in your system.	Killian has one.
Stealth-Boy	$1800	Makes you slightly invisible and increases chances using the 'Sneak' skill.	Random encounter (footprint) or kill the Nightkin at the Cathedral.
Vats Control Computer Key	$40	Operates the Vats Control Computer at the Military Base.	The Cathedral tech standing by the Vats Control Computer has one.
Military Base Key	$25	Arms the nuclear bomb at the Cathedral.	It's in the locker where the lieutenant is nearby.
Tape Recorder	$80	Records Gizmo's confession for Killian so that he has evidence to kill him.
Wire Tap (Bug)	$50	You can plant it on Gizmo's desk to give Killian the evidence	He needs to kill Gizmo.
Backpacks, Bags	Less than $100	It holds items. It's there to better organize your inventory at the expense of carrying weight.	???
Systolic Motivator	$150	It's required to repair the Power Armor suit on Level 3 of the Brotherhood of Steel.	???
Psychic Nullifier	$1000	Use it to "nullify" the Master's psychic attacks.	???

Holodisks

Holodisks can sell for an average of $100 and can be read with the Pip-Boy. They give out information on various subjects.

Here is a list of various holodiscs

Holodisk name	Selling price	Use	First seen
Vault Locations	100	Contains information on specific subject.	Mrs. Stapleton has this disc.
Mutant transmissions	100	Contains information on specific subject.	The dying mutant has this disc.
Ancient Brotherhood tape	100	Contains information on specific subject.	The dead paladin has one in the Glow.
Alpha/Delta/other holodiscs	100	Contains information on specific subject.	Get them from the Glow.
Mutant autopsies	100	Contains information on specific subject.	Vree has this disc. She has two copies of it.
Brotherhood history	100	Contains information on specific subject.	Sophia has this disc.
Maxson's Log	100	Contains information on specific subject.	Maxson has this disc.
Combination key for Military Base	100	Contains information on specific subject.	The nightkin watching the entrance to the Military Base has it.
Zimmerman's son's death	100	Contains information on specific subject.	Razor has this holodisc.

Keys

Most of the keys are a type of key card instead of a traditional metal key.

Item	Selling price	Use	First seen
Yellow Key Card	40	Open the elevators at the Glow.	Level 1, Brotherhood soldier
Red Key Card	10	Open the elevators at the Glow.	Level 2, dead soldier with remains of a radioactive rat.
Blue Key Card	10	Open the elevators at the Glow.	Level 4, only dead body
Red Pass Key	12	Open the locked doors on the first floor of the Cathedral.	Lasher has one. You can barter them from Ton and Sister Francis.
Black Pass Key	400	Open the locked doors on the first floor of the Cathedral.	Morpheus has one.

Books

Item	Selling price	Use	First seen
Scout Handbook	200	Increases Outdoors up to 91%.	Shady Sands
First Aid	175	Increases First Aid up to 91%.	Shady Sands
Guns and Bullets	425	Increases Small Guns up to 91%.	Gizmo's bookcase
Dean's Electronics	130	Increases Repair up to 91%.	Hub
Big Book of Science	400	Increases Science up to 91%.	Hub

Useless items

Name	Effect	Can be sold	Selling price
Beer	Lose one perception.	No	N/A
Booze	Lose one perception.	No	N/A
Nuke-A-Cola	You can become addicted to it.	No	N/A
Lighter	unknown	Yes	???
Box of Noodles		Yes	???
TV Dinner		Yes	???
Cat's Paw Magazine / You Have No Idea		Yes	???
T-51b Repair Manual	It's in the locked storage room at the Brotherhood.	No	N/A
Flower	unknown	Yes	???
Keys in Killian's store	Effect unknown.	No	N/A