Thermal printer. I play a lot of tabletop rpgs and wargames and it helps having the ability to print out handouts without worrying about how much ink I have left!

carbiners and keyrings. they are hella useful although while you don't need to get climbing grade you don't want the cheapest level of consumer crap. The spot bot is great if its still the same setup. basically it just automatically rotates a scrubbrush with soapy water and sucks it back up. It basically cleans a spot like you got on your hands and knees with a bucket and scrubbrush to clean it. Very small area but thoroughly cleaned. crappy unbrella hats. its nice to keep the rain off while being able to use both hands. folding kitchen step stool. the larger kind with two levels, a magna cart, thumb drives, steamdeck, man likely lots of other things.

For me, it’s a watch with a built in flashlight. Way more useful than I expected

a magic wand vibrator. truly next level stuff

It’s a pricey one, but a kegerator converted to corny kegs. Infinite seltzer water.

Plus room for another carbonated beverage of your choice.

Instant read digital thermometer.

Game changing.

No more over-cooked meats and ending up with tough chicken and rubbery fish. No guesswork if something has reached safe internal temperature. A must have in the kitchen.

Venta LW45 humidifier. easy to clean, uses like 8W/hour (compared to ~40 for ultrasonic or 300 for electric heating ones), quiet, goes through a 9l tank per day easily. And has almost no part that could break i.e. i could replace whatever could break easily.

but the price is insane for what amounts to a bucket with a fan

Mosquito magnet

Expensive to buy. Expensive and fiddly to run. But boy, does it totally destroy mosquito populations!

Especially if you start it up from the moment of Spring thaw... catch the very first females as they reach reproductive maturity. Breaks the population cycle. Love it.

A smartwatch or band. You'll never have to hear notification or ring tones on your phone anymore. In addition, sleep, heart rate monitoring, sports tracking etc. are a big bonus. Cheapest bands are very affordable and obviously there's no upper limit if you're a wealthy pig.

Even though I love my old square G-Shock, the pros of wearing my Garmin Vivoactive over it just outweigh the cons.

A tens unit. Literally the best $30 spent ever.

A small countertop water cooler/dispenser with a refillable filter bottle on top. (if you have the floor space, a stand up cooler is usually more energy efficient tho)

Something like this:

With one of these on top: https://www.zerowater.com/products/filtered-water-cooler

Clean filtered water, both boiling hot and almost ice cold, on-demand. Filling water bottles, cups, making hot chocolate, tea, instant noodles, even just starting to boil a pot using pre-heated water, taking so much less time. I love this thing.

When it comes to filters:

Zerowaters products specifically come with a Total Disolved Solids meter measuring in parts-per-million.

I was previously using a Brita filter jug which poured into a second filter from Aquapur ontop of my cooler.

My Tap water: 143ppm

Brita filter: 139ppm

Brita+Second filter: 87ppm

Replaced both with a single zerowater filter: 0ppm

After pulling close to 30 gallons through that filter its risen to ~8ppm (they want you to replace it at >6)

Project farm testing water filters.

Red light therapy panel.

Countertop ice machine. I keep mine on a table right next to my bed for infinite cold drinks whenever I want without getting out of bed.

Breville Milk Frother. Got one 10years ago. Really elevates your morning cup of coffee or tea and also great for putting on porridge. They've gotten ridiculously expensive though.

Cotton floss, portable water pick, electric toothbrush.

You cant afford to have dirty teeth.