Just did a quick look, 2-3 places and of those, the only one who still seemed to have it was BlueLaser, which is a rather expensive place, but here you go.
If not digging after the "OOP" Megastar or Deltamac version you can also wait for Joy Sales, which plans to release both two parts. Unfourtainly no date for the release
Just a tip if someone still are after the OP-DVD's, I've watched the MegastarDVD of LAOTL 2 and the cantonese audio-track is bad because it's shifting to mandarin sometimes. The remixed sound isn't good either. Maeby I just got a bad disc, I don't know