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Looks like 5ft is the common length. I dont see anything longer than that but you might want to try other local electronics stores.

You could always grab a cigarette power cord extension from...

The volts should be written on the side of the plug... does it say 5v? If so, any 5v cigarette adapter should work.

The question is, how long is your current cord? How long do you need it to be?

You should be able to find a compatible power adapter at radioshack or online via amazon. Typically the plug is a set size depending on the number of volts required so you cant really go wrong. Take...