Declaration: I am not associated with the website, I am interested because I am a hobbyist and competent with a soldering iron. Even those who are not can ask the vendor to knock up a system for a fraction of the price offered by a commercial DAC. Whether it sounds similar or equal to or better than commercial system, you need to try to find out. I am tempted to find out.
Anyway the web is:
Caution: Please read the fine print carefully.
BTW the vendor seems genuine because I have and many other have bought similar items from him.