Hopefully some reliable merchant will have this up on Amazon Marketplace at a reasonable price before long. When they do, I'll be ordering. My copy of Season Two should hopefully be cosying up beside my desktop before October sets in.
I'm actually kind of relieved about the lack of slip cover myself, albeit for purely selfish reasons. My copy of Season One (which, thanks to my extremely disobedient DVD drive, I only got to play successfully last month - I'd previously let the blame lie with the discs themselves) was sent to me without the slip cover, and I really didn't have the energy to kick up much of a fuss over its absence. It might lack that blurb on the back, but the case itself looks respectable enough without it.
All in all I think dvd (and cd) slip covers are more trouble than they're worth. They may look rather smart and stylish when on the retailers' shelves, but once you get them home they're the sort of thing you tend to misplace and then accidentally sit on, or else find some other way of bending out of shape.