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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: $5.74
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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: $5.30
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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: $5.21
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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: $5.21
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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.