Kino on Video will be handling the DVD release, which is scheduled for release in 2007. You can purchase the DVD direct from Kino: http://www.kino.com/video/, you can rent it from Netflix or Blockbuster Online, or you can purchase or rent it from any local retailer or video store.
"OLD JOY" will come out on DVD on May 1, 2007. You can pre-order the DVD from Kino as early as April 3, 2007 by visiting http://www.kino.com/video/. You can also put "OLD JOY" in your Netflix or Blockbuster Online queue, and start soliciting your local video stores and retailers immediately.