What's the most futuristic piece of tech you can buy for under $100?

Still this thing, 20 years on:

If you shop around you can find a Brother (B&W) laser printer for about $100.

Imagine this weird future: Printers that always just work no matter what type of computer you have or how long they've sat since you last used them. And the "ink" cartridges last forever. And you can buy 3rd party refills or even refill them yourself. Plus it's completely reliant on microplastics to do its job, what's more futuristic than that?

A bow drill fire starter.

...I suppose it depends on what you assume the future will be like...

Barring that, you can get some small vials of tritium gas for under that price.

3 sea shells.

Probably a cheap 3D printer

A 1-terabyte MicroSD card

A knife. Futuristic in that it will be handy for hunting and self-defense after the future collapse of civilization that results from our insatiable appetite for consumption - of, among other things, useless gadgets.

A full working computer, more powerful than what we used to go to the moon, and using less power than a light bulb.

It can take many forms, like smartphones, SBCs or older PCs/laptops.

I once found a curved 4k monitor at my local thrift shop for $70.

I feel like that really depends on how you view futuristic.

I think things with colored e-ink displays, USB C chargeable AA batteries, handheld emulators, 2230 NVMe drives, and USB C power portable displays are really cool but I feel like their availability these days has made them lose a bit of their futuristic luster. They would have blown my mind when I was a kid.

More niche products like Meshtastic and ESP32 Marauder devices are things I view as futuristic (and can be found for under $100).

Raspberry Pis and other microcomputers can be had for pretty cheap, and they can be put to a surprising variety of tasks. You need to be a bit of a jack of all trades to fully embrace that DIY element, but I'd bet that showing off a project that you mostly built yourself would be seen as futuristic by most people.

An R36s is like 40 bucks, and can emulate a LOT of old game consoles. I think that's pretty neat

Devices less sophisticated than smart phones were once pretty common in sci-fi novels, but they still achieved the same sort of thing, all the world's knowledge in the palm of your hand.

You can get smartphones for absurdly cheap these days, and while crappy by modern standards they're still technological marvels.

lighters. fire on demand! for all of preindustrial human history these things would be worth more than gold

I think the deauther watch is pretty cool if we're thinking cyberpunk-esque

https://dstike.com/products/dstike-deauther-watch-v3s

You can buy a cheap smartwatch that will monitor your pulse, give you a pulse oximeter reading, handle text messages and phone calls, take photos, and also within a reasonable margin of error check your blood sugar for about $35 on AliExpress.

Bluetooth headphones/headset/earpiece. You too can look like Uhura from Star Trek by sticking a wireless speaker in your ear!

A COVID vaccine (offer not good inside the US)

what is “futuristic” in this context?

A calculator is pretty futuristic depending on where you start

£76.77

Anything with GPS capability

A smartphone

5 months of an OpenAI subscription

You can buy a drone for, like, $5. So a swarm of drones for $100 seems pretty futuristic.

A Voxellab Aquilla FDM printer. They're regularly on sale for about $70. Maybe cheaper these days since they're kind old now.

Amazon and Walmart have microwaves under $100

Otamatone.

It's a synthesizer shaped like a note with a mouth and eyes.

A basic DNA test can tell you your ancestry back thousands of years and identify numerous genetically determined traits. It's kinda crazy what kinds of things they can tell you about yourself.

A 1TB micro SD card

you can get several smart outlets around your home for that, have fans and lamps and humidifers etc all remote controlled even with your voice.

A screw driver. Cause everything seems so much screwed.

Sous vide