Honestly?

A fidget cube.

Fidget toys got a bad rep, especially after Fidget Spinners became trendy for the younger generation.

But just having a little thing I can toy around with has been great for my pens and game controllers, as in the before times my grabby hands would fiddle with them whenever I was thinking about shit and it was bad for their durability.

For less than a dollar? (ay, currency exchange rates) Yeah, one of the best things I bought.