Here is the link and price.

http://www.teroforma.com/Set_of_9_Wh...nes_20187.html

Set of 9 Whisky Stones
Ideal for chilling your favorite spirit without diluting its flavor
3/4 - 7/8" | Natural

Milled in Perkinsville, VT by the oldest soapstone workshop in the US. Add three chilled stones to your next dram, let stand for 5 minutes and enjoy. Set of 9 stones + muslin storage bag. Not for use with larger volume drinks.

$20.00

http://www.kegworks.com/product.php?productid=173722