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

I once picked up a used Bryston .5B preamp for $300.  Because it was 18  years old, it was still under warranty.  So when it developed a problem in the phono section, I shipped it off to Bryston.    Just a few weeks later, they fixed it at no charge, gave me a new power cord, new shipping box AND paid the return shipping.

It was a fine preamp.  I replaced it with a VTA tube preamp which I love.  There wasn't anything wrong with the Bryston.  I just wanted to go from solid state to tubes.

Audiolab 6000CDT, Denafrips Pontus II DAC, and Buchardt Audio S400 MkII speakers......all perform at double their purchase cost

Tekton Lores - $1200 

VanAlstine SET 120 Power Amp $1200

Schiit REKKR Power Amp. 2 watts for a desktop or horns. $150 

Wolf von Langa spekaers!!!!

Schiit Audio Freya (outstanding), Loki, Bifrost 2-64, Magni +, my Pass XA-25 (not cheap, but a bargain), Dennis Had Firebottle SEP, my ancient Linn Basik/Akito (500 bucks)...Kimber 8PR (newest version) cables...used and inexpensive REL subs...I could go on...