I bought a piece of 1.5 inch stiff foam to try to fix a sag in a bed. It didn’t work but having that thick piece of solid foam around has been a life saver.
Need something flat to put a laptop on? Throw it on the foam. Going to be doing something that requires you to be on your knees for a while? Get the foam!
It went from stupid purchase to something I’d gladly replace if it broke.
Wireless headphones. The original goal was working out and I didn’t want to carry my cellphone on the hand. I never went to work out, but it turns out to be very convenient when my neighbors are being loud, since it has noise cancelling, and also for chores.
Also, some better clothes. For context, I’m FtM. My sister and mother are vain and buy chic clothes like every month, so I always had a surplus of hand-me-downs. I didn’t want to buy more clothes because I already have perfectly serviceable unisex clothes on my closet, but when I donated out all my feminine-cut clothes and shoes I found myself lacking clothes so, yeah, I went and bought the stupid clothes. I fucking love them and wear them on every opportunity I get. They make me feel so much better :)