Smaller plug-in AC Purifiers -- Shunyata, iFi, Puron...something else? What do you like?

@hilde45 I bought mine thru Sounds Of Silence it was around $400 (they retail at 500)

@rsf507 Not there anymore.

$400 is a lot for a plug-in, in my opinion, especially when I'm seeing people say (about these and others) that multiple plugs are better. That adds up quickly. To each his own, of course.

@hilde45 just looked it’s on their blog page

You really only require one of these from my experience yes other options more might be better.

IMHO go with a used Audience Adept Response AR2/AR6 or a Shunyata Hydra rather than multiple single outlet plug-ins.  I have seen Hydras as low as $400 - $800 on the used market.  

An isolation transformer beats the lot - but it's pricy, and not that convenient.