Those offers have been all "old" 40GB stock. Not a bad deal as such, but that there are numbers around to be pushed out as broadly advertised offers from some of the larger electronics retail chains half a year after it was supposed to be discontinued could be construed as a bad sign.
They have been 80GB units in the Netherlands and Belgium, though maybe they were still packed in with sixaxis rather than dualshocks, who knows.
The point is though that this is exactly what you tend to see happening just before an official price-cut hits, isn't it?