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

Was purchasing a beautiful Luxman L-100 in 2002 from a music teacher a few towns over. While there I was admiring some of his other pieces & we made a deal on his Sansui, AU-9500. Both great components. We're shaking hands on the way out when he points to a box on the floor. Tells me "why don't you take those too, now you'll have a complete setup". Box contained a pristine set of 11ohm Rogers, LS3/5A. I offered to purchase those as well and he replied, "I have bigger speakers now, you take those" pointing to a room filled with Gershman & ARC and a Baldwin, Grand Piano. There is no better deal than free, lol. What a wonderful old gentleman with great taste in Audio.

The biggest bang for my buck was buying a Linear Tube Audio Micro ZOTL or MZ2. This high-quality headphone amp, preamp, and class A 1-watt power amp makes this the Swiss Army knife of Audio.

Pair of Carver Silver Seven 900.. for waaaay less than $32,000. With all new KT-120s.

I bought a new pair of Thiel 2.7 when they were clearing out the a- stock after their closing was announced. Nearly 75% off, they were the stunning birdseye maple. 
probably the most beautiful wood finish I’ve ever owned. Even my kids were impressed. 

Inexpensive is rather relative term... Any of this is not an necessity and not "must have", like food - which can, like right now, get unnecessarily expensive. While I am not wealthy nor rich, my understanding of a bargain in this hobby is directly related to the ratio of enjoyment to the price paid. Shorter period I kept it, less of the bargain it was.
Listed are components that I had, or still have and enjoy. And by my definition above, my system is the real bargain. Nordost cables included, and they are not cheap by any measure...

For the money:
Thorens TD160 with SME 3009
Audio Note CD1
Bel Canto S300iU with Dynaudio X12
Ortofon Quintet Black MKI

Overal:
Jelco TK series tonearms; I have 850
Koetsu Black Goldline
Capriccio Continuo Auralea 309
Martin Logan Motion series (HT only)
Any vacuum record cleaner; I bought my VPI 16.5 more than 20 years ago, and it is still doing great cleaning.