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...and my old sites have either changed or disapeared
EDIT: After looking at the whole sale I think what I am mostly likely to buy is all of Steam Detectives for $30. ADV has had big sales before, but this is by far the biggest yet. Almost every anime they own is on sale in a cheap box set or individual DVDs. Also, the first volume of the Ray manga is on sale. I highly recommend it.
Let's be honest here, at least.
I believe that this is a legitimate place only because it was recommended by animesuki.com.
The point is it's cheaper to do it this way and everything I've ever bought from any import site is legitimate (though I haven't used the one I linked earlier, mainly because I haven't bought anything for a year and my old sites have either changed or disapeared). Any import place I've ever gone to always has a 26 episode series selling for anywhere between $20 and $40 and it's always identical to the American version (if it's already come out) except you don't always get all the special features and the menus are usually different.
"...except you don't always get all the special features and the menus are usually different..."
The last two are very good signs that what you have is not a legitimate release. As is having a 26-episode series on two or three discs. This has nothing, in and of itself, to do with the quality of them (I've seen some pretty atrocious HK releases, as well as perfectly fine DVD rips).
I'd say that if you're going to give someone money for content, you shouldn't be giving it to people who stole the content in the first place. If you don't feel the same, that's your concern, but at least recognize what you're dealing with.
Anime in particular is extremely unlikely to use region 0. The Japanese publishers are afraid of re-importing, and the US publishers are afraid of piracy. If it's region 0, it's almost certain to be illegitimate.
Rosencrantz and Guildenstern are Dead, for those who are wondering.