Best bang-for-buck purchase you have made?

Linn turntable,dynavector 505 arm and dynavector ruby cartridge all thrown free with my first major purchase of electrostatic speakers and threshold electronics 30yrs ago.
Otherwise, a (tested) perfect luxman R117 receiver with remote for $125 on ebay and my (9/10) magnepan 1.6 QR speakers for less than half list price.

Addendum:
Two pairs of Apex signature speaker wires (purchased from on line reviewer) as well as my Cogen Hall EM digital cable. ( I will never part with these cables). In retrospect, these were more of a gift than a sale from the prior owner.

NOTHING! --- I pay through the nose for everything! :)

When Federated stopped carrying Luxman equipment, late 70's early 80's ?, the West LA store blew it out at more than 50% off. I bought the T-12 tuner; C-12 preamp,and G-11 equalizer for $825($1785retail) new in sealed boxes! I used a Dynakit Stereo-70 then an Eagle 2 to drive Sonab-116's and later Dalquist DQ-10'si

Without a doubt my Channel Islands Audio VDA 2 DAC. Exceptional sound and build quality for $599. The price to performance ratio is high, you will spend much more to obtain better sound. I felt that it sounded better than the Benchmark, which while very good has too many bells and whistles for my tastes. In addition the VDA 2 uses a fully discrete analog out.