Thanks for the info rudiger! It is a big world out there for collectors! And as you mention these prices is out of this world! I am just a bit skeptical about the authenticity of some, due to their showing up in Asia, (Korea, Hong Kong etc.) I guess we (when I say we, I mean DS/MK fans as a whole) are responsible for some of the prices, because we sometimes buy things we believe that are harder to find than they actually are.
By the way, do the longboxes fold in and make a regular CD (digi or jewel case) or are they always like this? I have an INXS longbox, but it gives instructions how to fold it and make it a digipac.