Hi-Fi Second-Hand Resellers

Audio Extasa Vintage Hi-Fi

Decibel Hi-Fi Second-Hand Kit

Hi-Fi Exchange

Simply Hi-Fi

Les Wallis Audio

2nd Hand Hi-Fi – UK Based     Good site but its in the UK. Power supply is the same (220/240v)…. just change the plug

Classic H-Fi for Old Skool charm  Awesome hifi from the original 60/70’s integrated units with timber! Sydney site too.

Naimlylinn – Second Hand Naim and Linn Hi-Fi in the UK

The Vintage Knob – Hi-Fi Research.   This site is great for research if you are looking for a component but cant recall a model number. There are often really good reviews of components.