Meteorites are usually sold by weight. The meteorite collecting community uses the metric systems to weigh meteorites. Therefore, weights are measured in grams and kilograms, and dimensions in centimeters and millimeters. Like most collectables, a meteorites commercial value is based upon a number of factors including rarity of type, provenance, condition of preservation, and beauty or aesthetic appeal. New and noteworthy meteorites should be made available for the scientific community to study. After the meteorites are analyzed, surplus specimens find their way onto the commercial market. This process of acceptance into scientific literature can led to the overall commercial value of the meteorite to rise. Unclassified stone chondrites picked up by nomads wandering in the Sahara Deserts are readily available for about $0.50/gram. Attractive stones from the Gao-Guenie witnessed fall (Burkina Faso, Africa, March 5, 1960) can be purchased for about $1.50/gram and a top quality one-kilogram specimen of the Campo del Cielo iron meteorite from Chaco Province, Argentina can be yours for about $400. The Russian iron Sikhote-Alin (fell February 12, 1947) is the largest single meteorite event in modern recorded history and individuals — meteorite specimens which landed as one intact piece, rather than exploding on or near the ground — are coveted by collectors because of their marvelous sculptural qualities and surface features. A premium Sikhote-Alin specimen will carry a price tag of $2 to $3/gram.
http://geology.com/meteorites/value-of-meteorites.shtml
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