I got one directly from Meguiar's, and it is FAR superior to the ones I've purchased at WalMart and KMart; It is softer and more pliable, and easier to work.
At first I thought that you guys had changed the clay bar, but the more I think about it, it could also be that the bar is fresh, because one of the things I've always hated about the bars that I've purchased at the chains is that they are hard and unpliable, especially when cold. Those bars could be "stale".
If "staleness" is actually the cause, the reason could be uncompetitive pricing, you know. I've gone into KMart and Pep's and seen the Meg's bar for a few $ more than Clay Magic. Anyone who knows about clay will also know that Clay Magic is a reputable product, so the choice isn't really the same as the "Meg's at $5 or TW at $3" one.