Armin Schaefer sent me 8 P. tweedei that were imported by Ruinemans to Holland.
They really are the correctly determined tweediei. In the meantime they appeared in some shops in German towns, too.
The posting to Germany took one day only, but the subsequent posting of the parcel to me took another three days. Nevertheless, the animals were alive and completely sound. But Armin packed them in a very experienced way: in a small styropor-box, each in a separate small amount of water. Very small indeed (not much more than 100 ml), with a leave to hide. This small amount of room and water is fully sufficient for one individual in good condition.