www.ebay.co.uk one of the best places to obtain meteorites but always look for the seller Being a Member of the IMCA see http://www.meteoritecollectors.org/ be carefull and always ask an expert, or read up before buying for the first time!
http://www.meteoriticalsociety.org/ the governing body that certifies new finds.

http://www.bimsociety.org
Why not come and join us at BIMS?