Some more:
http://www.marchandelec.com/
http://www.parts-express.com/
http://www.mouser.com/
http://digikey.com
http://http://www.newark.com/
Please note that partsconnexion isn't the primary distributor for DIY parts while mouser, newark and digikey are the ones to get the best deals per/unit of what you're looking for. parts-express may have similar high-end connectors as partsconnexion to compare.
http://www.marchandelec.com/
http://www.parts-express.com/
http://www.mouser.com/
http://digikey.com
http://http://www.newark.com/
Please note that partsconnexion isn't the primary distributor for DIY parts while mouser, newark and digikey are the ones to get the best deals per/unit of what you're looking for. parts-express may have similar high-end connectors as partsconnexion to compare.