I currently have the Fantagraphics special edition which covers the first seven volumes of Usagi and, since nothing seems to be happening with a potential Dark Horse special edition, I'm considering just buying the individual volumes from eight to whatever the newest one is.
That said, what is the difference between the HC and TPB versions? I've read that the DH hardcovers have some extras that the trades don't but what exactly are the extras? And what about covers? Are they a HC exclusive?
Lastly, just how hard is it to find the hardcovers? Were they all limited prints? I have a friend of friend who is willing to sell me the Grasscutter HC and a couple others pretty cheap but I'm still not sure that it's worth the effort and expense even with those volumes accounted for.