These 'rocks' look amazingly like real rocks. They are actually made of wool and come in a variety of colors: natural (whitish); light, medium and dark grey; and rust. They are made by women in South Africa as a part of a job creation program that supports their independence. THese make great pin cushions!
There are 3 sizes of rocks:
small (2"-3") - $9.50/each
medium (approx. 4") - $13/each
large (approx. 6") - $17/each
There is one boulder in a medium grey measuring approx 12" x 10" x 6" - $250.
New Option
There is also the option of getting a sack of 5 rocks consisting of one large, one medium, and three small ones: Price $55.