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

All the Dunlavy speakers through the years and most recently the Doge Dac 7 Mk II. This DAC is nowhere close to broken in but is already the best I've ever heard.

Reference 3A MM deCapo i speakers. After decades of a parade of speakers from ProAc, Thiel, Merlin, DeVore and others, the de Capos are the ones that most often surprise me with what I’m hearing. And, a Nelson Pass designed Amp Camp Amp in my office system. Remarkable sound at a silly cheap price and a weekend of fun building it.

In my admittedly small amount of gear over the past ten years or so I would have to say the near new Maggie LRS I picked up for $550 a few years ago.  Even at retail they are a fantastic deal IMO.  

Audio Research Classic 60 (2 years old), ARC 3 meter litz speakers cable. ARC 1 meter RCA IC and ARC 1/2 meter RCA IC. All for $1600 in 1992.

ARC Classic 60 amps (30 years old) sell for this today.

Empire 698 turntable (store demo) for $150.

Bryston 4B3 (store demo) for $2750.

Klipsch La Scalla II (as new) for $5000 + free shipping.

The one that got away: Box full of assorted Black Diamond Racing cones, squares, gizmos. Easily 20 pieces. $100.

Trading my DQ-10’s for a pair of Acoustat Model X’s.  I also was able to sell my Hafler DH-220’s!  Still have the Model X’s, but I don’t listen to was much as I should.