High quality switching 'wall wart' AC to DC 5V 2A wall power supply manufactured specifically for Spark Fun Electronics.
CR1225 12mm 47mAh coin cell batteries. Perfect small battery for miniature sensor node applications.
This is a 9V battery pack with on/off switch and a 2.1mm barrel plug, you get both parts and will have to solder them together. Use this to battery-power your Arduino (or other electronic projects).
This is a really nice power supply. It's a switching DC supply so its small and light and efficient. It is thin so it fits in power strips without blocking other outlets.
It's a nice quad-AA battery holder, with 6" leads.
A nice 6AA Battery holder in black plastic with wire leads.
The NCP1402 is a 5V Step-up DC-DC converter. This breakout board will accept voltage inputs between 1 and 4 Volts and output a constant, low ripple 5V output capable of sourcing up to 200 mA.