what are your top "audio bargins" in your system history?

New Large Advent Utilities, $148(?) at Tech Hifi in 1978 as a HS graduation present. Refoamed by Miller sound. Still in my secondary system

Ohm Walsh 2000s for $2800/pr in 2009. End game speakers for me.

A pair of Vandersteen 2Wq subwoofers bought used for around $800 each. Never will they leave my system.

Arion Audio S500 stereo power amp. Got a special price on this one, but even at it’s list price at the time, $2500, it does everything I want an amp to do, nothing I don’t, and I can carry it under one arm if I need to.

Highly modified Beresford DAC by K Works. Only goes up to 96/24 and lacks USB input, but outperforms modern DACs costing much more. I paid $500 used including power supply.

Custom Sound Anchor stands for the Ohm speakers. Solid, effective and affordable.

16 years ago I bought a used pair of McIntosh mono blocks and tube pre amp to drive my 3.6 Maggies.  I could sell them for what I paid tomorrow.  Bit then I would lose the magic, LOL.

The one and only NAD 3020A back in the 70's.  Was the start of you can get quality without all the fuss from NAD.

2 pieces I acquired on used market

A used McCormack DNA 1 amp cica 1995

Great piece that I intend to have upgraded at some point by the designer Steve McCormack 's company.

Also a used pair of Reference 3a L integre floor standers. I find my self listening to them more often than more expensive SSM 6 Salk Sound stand mounts which I bought new

Little Feat Time Loves a Hero test pressing with white label. 50 cents at a thrift store. I have over 2500 LPs and this is still the SQ champ. Runner-up is a set of Bowers & Wilkins DM 110i. $50 thrift store. These were cheap speakers to begin with so there's no way they should sound as good as they do. I think it has to do with the synergy I run them with Quicksilver and Prima Luna monoblocks