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

I've gotten some good deals over the years. A few years ago I bought a Janis W1 subwoofer for $41.00. I think that it must be the best bargain that I've ever bought. Another one is the inexpensive Dayton Subwoofer amp that I bought to power it that's  better than the original Janis Interphase amp and cost just $220.00. Speaking of $220.00, in 1979 I bought a pair of Mcintosh MC60's that I'm still using as my main amps today. I paid $110.00 for each. 

Fo.Q Tape

I paid a dollar for about as mint as it gets of Beethoven's nine symphonies, Karajan/ Berlin on a tulip bordered Deutsche Grammophon box set, most sides not even a pop on them.

$40.00 for an unopened box set of the 58-65 Solti / Vienna Wagner Ring.  I have only seen two sets, one nice condition, the other acceptable, and any other set, trashed.  I almost wet my pants when I saw it, an unopened box as I wasn't even shopping for music.

I wonder if the SL600's I donated to the local thrift store ever found an appreciative home. I wonder, too, how long the tweeters lasted, or if the new owner even gave a damn.

Plinius 8150 Integrated Amp

Parasound Halo Integrated

2 world beaters at their price point...especially used.