ive ordered from them plenty of times, so have a few of my friends, very reliable, good shipping(now) and cheap, it says out of stock because it hasnt been released yet, so they dont have any physical copies, they are however, opeths north american distributor. they are taking pre orders now, if you click on some of them(the big set and the vynil) i believe it says this item is no longer available. so yo ucant get those, but the rest should still have copies left(with signed booklets) so id get them now, just order them, they dont charge you right away, they'll charge you near the release date(june 2 or 3) and ship them promptly thereafter
so if you love opeth, go for it dude, youve got nothing to lose(they've got some pretty good customer service too)