There's 3 things that really stand out for me that I would say made a massive difference to my life:
Cordless screw driver. Bought the day after building a flat pack bed with a crappy screw.driver that just shredded my hand. Thought it was frivolous at the time, but I've used it so much since. It's light, small enough to fit in my pocket and good for 90% of DIY tasks.
Tassimo coffee machine. Bought it 9 years ago, use it every day. Nice quick easy coffee. What's not to like.
My first DSLR camera. It was a Nikon D50 back in 2005/6 and it sparked my interest in photography to this day. It gave me a hobby I can take lots of places and do it alone or with others.
I never loved the D50 camera itself, but I did get some really nice shots with it
Back in 2017 while stationed in AZ I adopted a dog who was the cutest little Blue Heeler, for $5 we have been inseparable since and she is the single greatest thing that's happened to me.
Last year in April my Powerstrokes transmission failed and on a whim I bought a 98' 4 runner with 245k miles. We have now built the hell out of that little rig and have put 15k miles on it in 11 months
100 pairs of socks on Amazon. This sounds nuts but, I got 100 pairs of black socks 2 years ago for $60 because I was tired of my socks always missing. I still have 50 socks I haven't touched.
I didn't. I used to letters commonly associated with the state in my country. Sorry that you don't live here and sorry I wasn't more descriptive. Honestly even if I had adopted Mercy in that country she is still the best purchase