Another equipment suggestion thread but hard mode?

Looking for equipment suggestions to spend a $500 home office stipend.

I've got the basics-- standing desk, nice chair, great monitor, mouse & keyboard, headphones & amp, etc, DSLR webcam, 2x dogs.

Anything yall would recommend that may be a bit off the radar? My company will likely kill this benefit as soon as they can so trying to get in before that happens.