Audio deals you bought that seem impossible for the price?

QSA fuse. How is it possible to get so much improvement for only $71? 

Tekton Moab. Many have searched out the parts and documented these cannot be built for that price, the parts alone cost more than the finished product. Volume pricing brings his parts cost down, but that still leaves labor, equipment, and a huge manufacturing facility to account for. 

Raven Blackhawk. This amp combines in-house caps with some very high quality transformers and resistors. Even the printed circuit boards are JPL/NASA quality not at all your usual shoddy thin trace boards. It is 4 stage powder coated not painted, and built to last a lifetime. For under $4k? Today??! Impossible!

In 1998, I bought a beautiful back ash set of Spendor SP100s for $1800 from a wonderful member here. They were less than one year old and in perfect condition. He lived a few hours away, and I told him that I wouldn't be able to get there for a week, but I would express him the money, but he said no problem, he would trust me, and he did. It was a wonderful transaction all around, and a hell of a bargain!

While I have bought new components from my audio dealer, I've shared my goals and interests and purchased demos of McIntosh C2600 and MC 302, Sonus Faber Olympica Nova V and Glass Ultrasonic record cleaner.  On eBay I've purchased used Kimber cables.  Ultimately, bargain is in the eye of the beholder - I enjoy listening to my system and that's good enough for me.

@roxy54 That is a hell of a bargain for SP100s great speakers well done!