Hands down a raspberry pi 4. It's a perfect example of why "maintain is more important than obtain" -- what is the point of buying something that I can't "really" use?

The first thing that comes to my mind is an e-reader: always having my books with me encouraged me to read more. Following its purchase I read more books than I ever did since my teenage-hood (I'm close to 30).

Cross-body bags. Uniform black handkerchiefs. Good charging cables.

Scarpa Hiking boots. 24 years old, 20,000km walked and still worn every week.

Electric toothbrush.

Invest in your teeth. Trust me.

For me it has to be my tools. I'll go back to sleeping on the floor, counting pennies for gas fir my commute, get rid of everything else before my tools. Specifically my thin snap-on 3/8th ratchet and socket set and my cheap it tool kit. With those two sets alone you can fix a lot of things.

Though one of my best deals ever was a pretty good stove for $30, it mightve been damn near new. I bought from some young guy who looked like it was his first house, probably military by appearance and location, and they wanted their own appliances not the landlord grade stuff that was there. 8 years later, or whatever, and it's still great.

For time used over price it must be minecraft and my kindle, so many hundreds of hours on both of them.

To go along with the mattress theme, and since I’ve had two back surgeries (in my 30s after a car wreck), my sleep number mattress was a big expense but I was miserable and could never get a good night’s sleep before it. It’s been a game changer.
The other is a little more niche, but I’m a runner/endurance sports and my Balega socks have been incredible. They are $14 a pair (yes, $7 a sock), but they are easily worth every single penny. I’ve done 30 hour hiking/running events and my feet were the only thing still dry on my body thanks to those guys.

The good windshield washer fluid. The stuff that's a dollar or two more expensive. Rain basically jumps off my windshield, and I don't need my wipers above 50 unless it's really raining hard. When I actually do use my wipers, they work so much better.

I would love to hear some watch stuff, I've started getting into watches lately and have a Casio Duro on the way as my first collection.