The MHDT Labs website is up and they still sell their DACs direct on eBay, I just checked. Two listed right now. I got to know June (the founder) a bit years back and bought mine direct, and helping several friends who own them today. Whenever there were any issues they were always super responsive, or send a board or anything in question. Oddly enough, shipping here was only like four days, not sure how they were able to do this so quickly. Not sure if that continues though.
While others felt they needed to buy MHDT products through LTA in the USA, for some sort of extra feeling or sense of security, I never needed that. Always dealt with MHDT Labs direct, very successfully. A rewarding experience for me.