Online DIY electronics stores

• adafruit - New York City, USA - Twitter
• Cooking Hacks - Zaragoza, Spain - Twitter
• DesignSpark - by Electrocomponents (Radiospares and Allied Electronics) - Twitter
• DFRobot - Shanghai, China - distributors
• DWMZone - Shenzhen, China - Twitter
• element14 - by Premier Farnell (Farnell and Newark) - Twitter
• Go Tronic - Blagny, France
• Maker Shed - by Maker Media - San Francisco, USA - Twitter 
• Mouser Electronics - Twitter
• Olimex - Bulgaria
• reichelt - Germany
• seeed - marketplace - Twitter
• SparkFun - Niwot, Colorado, USA - Twitter - Mouser is one of their distributors
• SpikenzieLabs - Montreal, Canada - Twitter
• tindie - marketplace - Twitter

To be continued...