Where did you get them from? What do they cost?
-huha
Got mine in a small shop here in St. Pauli. But they're available online:
keyboard shakers
Designed by James Burgess
Colin Ross Design
About 12 Euros. Top is ABS or something, bottom silicone so you can open them.
On all the pics I've seen, pepper has four holes and salt has one. This has been changed as can be seen above.