Lets see:
- Robotshop, official Nano, headers: http://www.robotshop.com/arduino-nan-v-3-4.html
- Robotshop, official Nano, no headers: http://www.robotshop.com/arduino-nano-usb-microcontroller-v3-no-headers.html
- Robotshop, DFRobot Nano: http://www.robotshop.com/dfrobot-dfrduino-nano-usb-microcontroller-v3-atmega-328-4.html
- Jameco, official Nano: https://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_2121148_-1