D-Stone is a "label" - they've issued lots of DVDs.
some of them are way cool; others ... well, maybe they groove someone. it depends what you're into, i'm sure. recently i really like disk one of their New Barbarians 74/79 set; disk two (the Largo gig) isn't as good quality as the one i already owned. and the 81/82 set is pretty cool if you've never seen the footage.
if you're looking for factory-pressed DVDs, i don't know where you should look; if you're looking for DVDrs, you could put a trade/B&P request on some of the fan sites.
"What do you want - what?!"
- Keith