@Tracie24 Well air purifiers stock change very often, and it can be hard to find the link to one which you have used for awhile and would like to recommend.
I did purchase an air purifier yesterday, but I'm not ready to recommend it yet, without having used it for an extended period of time.
What I personally look for in an air purifier:
-Cheap (under $80 CAD or so)
-Quiet (under 25 db or so)
-Has an air quality sensor (usually PM2.5) built-in
The air purifier I purchased yesterday is currently on sale for $59 CAD ($43 USD) and fulfills all of these conditions.
I have amazon prime, so I usually test run the air purifier for a couple of days and decide to keep or return, which is what I'll do with this current one which I just purchased.