Feel free to donate if you'd like to.
LOTS of Rubik's Cubes (Currently I have a Professor's Cube , Shengshou 7x7, a few Mirror Cubes and I made a Soma Cube myself). I enjoy mechanical and combination puzzles so having more of those around my desk is always nice.
Physical copies of Physics, Math and CS books on my cloud drive.
A premium subscription to my current VPN provider and services that I use (including a few MOOC platforms).
Stickers: Vim, Emacs, Firefox, Arch, Debian, Linux, etc...