Amazon has a nice looking portable aromatherapy essential oil diffuser on sale for $7.99 w/ free prime shipping or standard shipping when spending $25.
Reviews are pretty good and the small footprint would work well on a desk IMO. Also has seven different LED colors (dimmable) which add a nice ambiance.
You should just be able to hit "Redeem" on the promotion link to get the sale price but you can also apply MKKLNDMJ at checkout.
https://www.amazon.com/dp/b01EMJIH4A
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