system
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I just ordered something from Itead and I must say they have very good customer support.
http://iteadstudio.com/store/
Others I use:
Dipmicro: on ebay or their site: Electronic components - dipmicro electronics
Bitsbox on ebay and their site: http://www.bitsbox.co.uk/
Dutch sites:
http://www.elektronicaonderdelen.eu/