Pick one item/pet to buy at a farmer's market, sold by a crazy man that claims to be from the future.
Once one item is bought, no one else can buy it in a "thread," he says.
After an item has been chosen, the item it is GONE, for good!

He's probably literally crazy, but he has some neat nick-knacks.

>Bolt Pistol; Plus 1 full magazine of 10 - Wax seal with an ]|[ symbol - Magazine marked "HELLFIRE"
>Power Sword; Not powered right now - Power cord is weird-lookin' - Still an awesome old sword!
>Bionic Arm; Installation instructions missing - Red fabric fashion decals - Good quality, probably!
>Battered Laspistol; Plus 2 power cells of dubious condition - Rattles when shaken - Scuffed and dented.
>Chainsword; Runs on any combustible liquid - Results may vary but never disappoint - Very Sharp!
>Fancy Combat Knife; K.D.N. standard, STC patterned - Brand new - Z-no-skin sheath included!
>Plasma Gun; Only fired once! - Charred and blackened anyway - Full magazine minus just one shot.
>Power Fist; Power field is fiddly - Works as normal else-wise - A 2-ton handshake! Powerful High-fives!
>Servo Skull; A 'normal' flying skull - Has a megaphone and laser pointer - Programmable in binary.
>Tan Helmet; Super sturdy biker helmet - Very light! - Has two cameras around the nose to see with.
>Meditation Crystal; Talks to you in your sleep - Calls you Monkey(?) - Sounds haughty and kinda sassy.
>Spiky Hoverboard; Originally used to actually fly - Rider never loses balance - Has black-metal motifs.
>A cute pet dog; Named Squiggly - Has a lot of teeth and no arms - Is a very good boy and barely sheds!
>A wriggly lizard; Called Ripsie - No arms? No legs? No problem! - Eats ANYTHING you want to be gone.
>Cat N-Shard; A robot? A hologram? Both? - Acts like a tired servant - No refunds on nuclear self-detonation.
>Ninja Star; Eight pointed and sharp! - Comes with necklace chain - Lots of good/bad luck all around it.
>Green Metal Cube; Don't.Open.It! - Or... maybe... - Mystery Box...?