It's funny that you post this. I was just browsing around today and discovered that Audio-GD just released a R2R DAC board for DIY purposes. It's not terribly expensive, but it is not a complete kit and it does require some additional engineering and parts (such as usb/spdif receiver such as Amanero or other, power supply, I/V audio output stage, case).
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This is my first post on these forums. I hope this is relevant!
Have a look at Soekris' OEM line, particularly the 1941 series: http://soekris.dk/dam1941.html
It does not specifiy NOS, so I am unsure about this. Also, it is not a "full kit"--you will have to source some components and a case, etc. These modules are used in a few commercial DACs.