Musical instruments. Was using a borrowed keyboard for the first 7 months, but when the owner wanted her keyboard back to take to college, I bought a very high quality instrument. Fast forward 6 years, and I'm also playing guitar. I started with a couple of free guitars, but can sense that I'll soon be at the stage where I need to upgrade to a better sounding instrument.
I have yet to own an Apple product. We don't have air conditioning, clothes dryer, subscription entertainment or dine in restaurants (unless traveling). Used to enjoy fine wine, but quit drinking entirely. Used to ride horses, but pretty much gave that up unless getting in on a free trial ride on a friend's horse.
Prescription sunglasses are my other luxury, beyond music. I can get by and be content with simple foods, running water, and a modest amount of electricity. But I need to keep learning songs and playing through the ones I've already mastered. I also can't bear being outside during the daylight hours without my prescription shades. That I made it through the first 30 years of life without these things surprises me.