Least expensive plug-in power conditioner that works

I’d just get this that should be more than fine…

https://www.usaudiomart.com/details/650075208-audience-adeptresponse-ar1p/

Thanks for these suggestions.  
I was wondering about products like these;

QKOIL QK1 AC Enhancer

QVIBE Qv2 AC Enhancer

Puron Power Filter
ifi AC iPurifier

As compared to the Shunyata Venom Defender, or a less expensive power conditioning strip like the Furman.

The Audience does look promising.

kn

Fwiw, I run my modem and router into a PS Audio Power Center w- Virtual Dynamics Power 3 PC. It’s a well built and reliable piece of gear. Does it make a detectable difference?…mehh, can’t say for sure. Nevertheless I refuse to plug any component of my system into a $5- power strip.

https://forum.audiogon.com/discussions/a-sanely-priced-power-conditioner-that-actually-works-onfilter-pdu?highlight=Power%2Bconditioner%2Bthat%2Bworks

While I think a lot of these AC issues have local environmental elements that may determine effectiveness and the right components to help, I do own several iFi AC purifiers, including those that came with the iFi Powerstation, and they made a real difference in my home. 
The AC Purifiers helped bring greater depth, greater air around instruments, and even (and I was really surprised with this) added a bit more natural tonality to instruments. 
They are not that expensive and are available on Amazon, so they might be worth trying one or two in your setup.