Comment by Kalanos
$28 bluelight glasses for the computer.
$18 ceramic pans.
$9 vertical monitor from thrift shop.
$30 chirp wheel for back cracking.
$180 theragun for muscles. Finds knots that you didn't know you had.
used dell server towers with 128GB RAM for linux
velcro cable ties + phone mount for bicycle + battery tester + usb controllers for emulators + sivga headphones (i think they are 5x more expensive now)
Seconding the vertical monitor from a thrift shop, I did the same thing basically by getting a Fujitsu monitor that can easily rotate and I'm incredibly pleased.
I use it with multiple Emacs frames because PaperWM (Gnome extension) makes it easy to scroll between windows (in this case Emacs frames).