Best bang for the buck


What’s been the most cost effective item you purchased for your system? 
I will go first- a Zerostat I bought 40 years ago. Next most cost effective purchase has to be a Denon DL103R cartridge which I bought new for $300. 

zavato

i bought the 10’ version of these for around $45 a few months and forgot about them.  finally tried them out over this past weekend.  obliterated and destroyed by far any speaker cable i  have (aq, ps audio).  damn well worth every penny.  Amazon.com: GEARit 10 Gauge Speaker Wire OFC 6 ft with Banana Plugs,in Wall Speaker Wire with Gold-Plated Connectors for Audiophiles,Hi-Fi Systems,Bi-Wire/Bi-Amp Compatible Speakers,Home Theater & Amplifiers : Electronics

 

My ESS AMT 10B speakers that I bought on Craigslist for $190. Spent about $400 returning them to original condition and I just love them. Replaced my Wavetouch Audio Anterros. 

A pair of Ohm Sound Cylinders from my local Goodwill for $39.75 including tax. Wide open 3-D sound from any spot in the room!