"Millions of live reptiles are sold each year for the pet trade. In 2001 alone, the United States imported just under 2 million live reptiles. Of these, over 500,000 were green iguanas (Iguana iguana) from Central and South America. Other species commonly found in the pet trade include the boa constrictor (Boa constrictor), ball python (Python regius), panther chameleon (Chameleo pardalis), and red-footed tortoises (Geochelone carbonaria). The United States annually exports more than 8 million red-eared slider turtles (Trachemys scripta elegans), the world's most commonly traded live reptile.
What is the United States' role in world reptile trade?
The United States is a major participant in world reptile trade, and imports an average of 2 million live reptiles and 6 million reptile products each year. Most live reptiles imported into the United States are imported for the pet trade."
http://www.worldwildlife.org/trade/faqs_reptile.cfm