Germany:

http://www.watterott.com/de/Robotik/

China:

http://www.1buycart.com/

http://www.valuehobby.com/

http://www.goodluckbuy.com/

http://www.dealextreme.com/

http://www.chinavasion.com/

http://www.buyincoins.com/

Electronic components

farnell

digikey

future electronics

arrow electronics

jameco

mouser

http://www.findchips.com/

http://www.embeddeddeveloper.cn

newark

http://www.ic-trade.com/eparts/LPC4357.html

http://shop.trenz-electronic.de/catalog/product_info.php?cPath=105_139&products_id=744

http://microcontrollershop.com/product_info.php?products_id=4597