Electronic Components Association (ECA)
Represents designers, manufacturers and suppliers of passive and electromechancial electronic components, connectors ,wire and cable, component arrays and assemblies, and materials and support services.
http://ec-central.org/

Mouser Electronics, Inc.
Dedicated to supplying design engineers with the most rapid introduction of the newest products, leading-edge technologies, and world class customer service.
http://eu.mouser.com

Power Monitor
At Hoyt Electrical Instrument Works, all meters (both analog and digital), testers, transducers and various panel-mounted components are built to satisfy the most demanding customers and are built to last in the field.
http://www.hoytmeter.com/