http://www.siemensjobcam.com/mobile-power-supply-unit/

Where I can buy a power supply in this way?
It is necessary to convert 120VAC to 12VDC (14VDC can also work – tell me!). It will run a car aftermarket head units with a 4-8ohm impedance accepted. Specifications for the head of unit is here: http://mobile.jvc.com/product.jsp?modelId=MODL028471&pathId=54&page=3 Thank you. Already checked with my local Radio Shack and can not do anything for me there (and I'm assuming online either). Any suggestions where I could look online?
Radio Shack may have them or try the Internet. His unit has a maximum power of 100 watts, so make sure your power supply provides at least 9 to 12 V DC.
Emergency Mobile Power Supply Review for iphone | ipod Touch !