XI Audio K-DAC is an R2R DAC that is their second attempt into the DAC market, after their flagship Sagra DAC. It's priced at $2584.
Hifiman EF400 ís the second all-in-one in Hifiman's history. It's fully balanced, built around an R2R DAC and a headphone amplifier that is told to be capable of running the Susvara. The price is set at $599.
Cayin RU6 is the first, portable R-2R dongle. It features a balanced output, and it costs $249.
Hifiman Deva Pro is an open-back, planar-magnetic headphone that can be used both wired and via Bluetooth, thanks to its Bluemini R2R module. It is priced at $329.