Permeable blocks (Ashton-U-Lyne OL6)

I know it's a long shot but does anyone know of any of these available?
Maybe leftover from doing their driveway.
We miscalculated and need more than we thought. They measure approx 23 x 16 x 6 cm and I believe are Marshall tegula priors.
If not free, we would be prepared to pay something for them. Thanks