Where do you buy your stuff?

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/