Treadmill. I live in a country where it's just not possible to run outside during winter so I used to gain some extra weight during those cold and dark months. Now I am in better shape than I have ever been during my life.

My Elora ratchet set, bought in '99, used it on all daily drivers and hobby cars, saved me loads of cash on car maintenance. (And several jobs in the house) still going strong, although both ratchets need maintenance.

LASIK Good quality gym wear (Lululemon circa 2015) Investing in mental health via a psychiatrist

This ipad I'm using right now, it has lasted me quite some time.

My Sony noise cancelling headphones (XM3). I love them and use them every single day. And also my wall mounted pull-up bar.

The engagement ring I proposed to my wife with. She said yes.

A 2.5" hard drive enclosure for 15$. 2.5" hdds are pretty cheap nowadays with pretty sizable capacity, got a 1tb toshiba for 30$, making them perfect for backups. Toshiba and western digital are the brands to look for. 2nd best purchase would be my digital license for cryptomator on android, encrypted cloud backups for most of the providers.

LASIK. And my $20 cast iron frying pan bought in 2001.

Creative sbs 370 2.1 speakers; using it for 19 years. The sound quality is the same as day 1.

The wired remote stopped working after 15 years, so I cut it off and connected the wires.

Brompton folding bicycle.

TKC 1800