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9V to Barrel Jack Adapter
Price: $5.32
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Sparkfun Item #: PRT-09518 -

This simple cable has so many uses! Plug the 9 volt battery clip onto a standard 9V battery and connect the other end to anything with a 5.5x2.1mm, center-positive barrel jack. Use this cable to battery-power any device that needs 9V and has an on-board barrel jack - it works great for Arduinos, development boards, evaluation boards, and more! ...

Barrel Jack Adapter - USB to 5.5mm
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Price: $5.76
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Sparkfun Item #: TOL-08639 -

This is a simple cable that adapts from a USB port to a 5.5x2.1mm barrel connector, center positive. This cable allows the user to use a USB port on a computer, laptop, or on our cigarette power supply to provide our development boards with 5V. The USB specification limits current consumption to a max of 500mA from a USB port but this is more than enough to run a simple development board. Cable length is 3 feet.

Barrel Jack to 2-pin JST
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Price: $5.32
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Sparkfun Item #: TOL-08734 -

Two pin JST connector to a 2.1x 5.5mm barrel jack, 6.25 inch long jumper cable. We use this cable to adapt from a wall power supply to a relatively small, SMD JST connector. We found that many of the SMD connectors used for battery charging were too large or were not capable of through-putting the current we wanted for faster charging. This setup, with a SMD JST connector and wall power supply, can handle up to 2A!

DC Barrel Jack Adapter - Female
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Price: $5.23
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Sparkfun Item #: PRT-10288 -

This adapter allows you to connect a barrel jack connector to bare wires. One end has screw terminals and the other has a 5.5x2.1mm, center-positive female barrel jack. If you have a power supply with a barrel jack and want to plug it into a breadboard, this might be the simple solution. Please be aware that the max current for this adapter is 10A.

DC Barrel Jack Adapter - Male
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Price: $5.23
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Sparkfun Item #: PRT-10287 -

This adapter allows you to connect a barrel jack connector to bare wires. One end has screw terminals and the other has a 5.5x2.1mm, center-positive male barrel jack. If you need to connect bare wires to a barrel jack on an Arduino or a development board, this might be the simple solution. Please be aware that the max current for this adapter is 10A.

USB Car Charger - 5V, 2.4A
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Price: $6.65
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Sparkfun Item #: TOL-16886 -

Have you ever needed to power a project while in your car? Now you can without having to drag a computer along with this cost effective 5V, 2.4A USB car charger. These car chargers have a standard USB 'A' connector for the output so you can power your Arduino, Raspberry Pi, etc. through a USB cable. Any device that uses a USB cable for charging or power can be powered with this charger. Features: 2.4A dual USB Output Car Charger with Smart IC Autodetect with intelligent chip inside Material:...

USB Wall Charger - 5V, 2A
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Price: $10.55
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Sparkfun Item #: TOL-16893 -

USB as a power connection standard is common these days, but you don't always have a computer on hand so how are you going to power all of your sweet USB devices? How about a high quality switching 'wall wart'? This AC to DC power supply will do 5V at 2A! They're switch mode power supplies which means the output is regulated to 5V. These have a standard USB 'A' connector for the output so you can power your Arduino, Raspberry Pi, etc. through a USB cable. Any device that uses a USB cable for...