I posted one from Green vs. Red online on YouTube. The audio quality wasn't DVD worthy or we would've included it. You can thank my internet choking both times.
https://youtu.be/2Pd9RZROD7kThat was actually the second take. The first one had sync issues so I just sampled some of the best bits and posted them here with contextual screencaps:
https://youtu.be/0iyp3Vz95jYBye Bye, Lady Liberty also had a second commentary by Ryan G. and Mike L. that I will post on the ol' website if i can get their permission.
As for why there aren't more commentaries, it's a time thing and an info thing. I can get plentiful info on the earlier Lupin works but I'd mostly just be rambling over other ones and I don't think that's of much value. So I just write up liner notes with the few things I know and call it good. Would you prefer a sparse commentary? For example, compare Fuma Conspiracy's relatively dense comments with Episode Zero's less focused approach.