Adafruit.com

Sparkfun.com

Seeedstudio.com

Bricogeek.com

Watterott.com

Netduino.com

Freetronics.com

Cutedigi.com

Circuitsathome.com

Hacktronics.com

Dangerousprototypes.com

Letsmakerobots.com

Cooking-hacks.com

Switch-science.com

Littlebirdelectronics.com

Emartee.com

Epictinker.com

Shieldlist.org

Practicalarduino.com

Epanorama.net

Repairfaq.org

Datasheetarchive.com

Datasheetcatalog.com

Batteryuniversity.com

Datasheetdir.com

Digchip.com

Usersmanualguide.com

Servodatabase.com

Allpinouts.org

Interfacebus.com

Wvshare.com

Arduinodev.com

Electrodragon.com

Cerebralmeltdown.com

Extremecircuits.net

Open-electronics.org

Jeremyblum.com

Aeroquadstore.com

Canakit.com

Hwkitchen.com

Tinkerforge.com

Moderndevice.com

Multilogica-shop.com

Nuelectronics.com

Ruggedcircuits.com

Bhashatech.com

Bowdenshobbycircuits.info

Nabduino.com

Protocentral.com

Tigoe.net