Least expensive plug-in power conditioner that works

Not sure why, but most people responding to the OP's question have missed the point.

@knownothing asked specifically about "plug in power conditioners". Not, power strip style power conditioners like a Furman PST-8D or the Audioquest Niagra.

My vote is for the Fuhrman AC-215A for your uses.  It is a very simple little box with 2 outlets, a switch, and a 10 amp circuit breaker. It uses Fuhrman’s top line LiFT line noise filtering and also their best SMP spike and surge technology as well as non-destructive EVS technology to guard against dangerous voltage irregularities.

Ive used this unit successfully for a few years now and it had no deleterious effects on the sound of my Luxman L-590AxII Class A integrated amplifier.  I moved it to my computer room when I bought a functionality identical Fuhrman unit with more outlets for my hifi.  Plug in a strip to extend one of the outlets to several.  Currently $123.00 on Amazon

@cbrez thanks, this is the kind of feedback I was seeking.  I ordered an AC iPurifier and will give it a try and compare to the Venom Defender I already have.

Others, if you have experience with similar products, please share.

kn

@tony1954 - 💯 

@porchlight1 +1