What are some gift ideas under $100 that would upgrade your workspace?

The holidays and new year are quickly approaching... the perfect time to upgrade your workspace! What are some gift ideas that cost less than $100 that would help upgrade someone's setup? Could be either for productivity or just the atmosphere of the space. I publish a weekly newsletter (https://www.workspaces.xyz/) that highlights the individual WFH spaces of creative individuals and would love to be able to share some additional tips on what others are looking to add to their setups!