I'd never heard of any, but isn't this modern world wonderful that there already are such things? Not exactly dollar store, but a few bucks for one, and carefully hiding it.
https://duckduckgo.com/?q=bacon+smell+air+freshener
Years ago when a friend and I suffered under a nigger supervisor (a true racist who hated all white people), we thought of picking the lock to the nigger's office, then hiding a fish under its desk. We were going to pull out a bottom drawer, then throw a fish into the gap between the drawer and the floor, and let it decay all weekend. That sowapotamus was beyond lazy even for a nigger, so it was gone by 2 every Friday.