I own the Ayre Codex DAC and highly recommend it. Ayre Acoustics is a great company and all their products are excellent. I have used my Codex DAC as a preamplifier/DAC and also a standalone DAC. It is an outstanding performer in both applications.
Please see:
https://www.audiostream.com/content/ayre-acoustics-codex-usb-dac-headphone-amp-digital-preamp
Someone on Audiogon has an Ayre Codex DAC listed for sale at $1,100. Please see:
https://www.audiogon.com/listings/da-converters-ayre-codex-2017-08-16-digital
Please see:
https://www.audiostream.com/content/ayre-acoustics-codex-usb-dac-headphone-amp-digital-preamp
Someone on Audiogon has an Ayre Codex DAC listed for sale at $1,100. Please see:
https://www.audiogon.com/listings/da-converters-ayre-codex-2017-08-16-digital