Just posted on USAudioMart
https://www.usaudiomart.com/details/650043657-paul-pang-audio-ocxo-quad-switch-s...
I'll give preference to Decware folks, of course.

One of the best switches for audio! A Paul Pang PPA Studio OCXO Quad high-end audio switch in fantastic condition. The ultimate upgrade for front-end digital streaming via Roon, Tidal, Qobuz, etc., or via a NAS or PC, by optimizing jitter, phase noise & timing errors.

The magic comes from four built-in 5-port Gigabit switches designed to be daisy-chained for best sound. It has 5 built-in low-noise audiophile linear power supplies (one for the unit and one for each of the four switches). It uses high-quality Oven Controlled Crystal Oscillator (OCXO) master clocks. Comes with three Paul Pang TZ Yun audiophile LAN cables RJ45 CAT6a 10Gbit/s Ethernet LAN 20cm length (value $99/each).

The results are extremely low phase noise, noise floor, and jitter values. Music via streaming services & NAS will now sound 100% analog, natural & realistic, with a wider sound stage and more pinpoint imaging. Even video image quality via Netflix or other internet services improves drastically. The sound quality of this Quad OCXO Switch beats all other audiophile switches in the world so far, except for perhaps one that retails for twice the price.

The normal retail price new is $2299.

Asking $1300 plus shipping. PayPal Friends & Families, Venmo, Check or Cash, please.

I highly suggest using a good quality power cord and LAN cables to/from the switch (I used AudioQuest Vodka and Diamond RJ/E with awesome results).  

https://ppaproduct.blogspot.com/2015/07/audio-grade-switcher.html

Alpha Audio testing and review:
https://www.youtube.com/live/Fok1d_VkfCk?si=150AVKzpug_LQBWE