The Fringe Magazine Spring 2011 Edition is the only one in the series (and the first) that is not showing up in the Cash Shop, and when you search it there is no reference to the Cash Shop unlike the other Fringe Magazines.
It's honestly too late to add it to the sale now, since it'll be ending in a few hours, so I'll make sure to throw that in the CS Hustler. :)
Thanks Amber, hope I don't miss it!