Canon AC Adapter Kit ACK-E4 for 1Ds Mark III; 1D Mark III and 1DIV.
It is this one:http://shop.usa.canon.com/webapp/wcs/stores/servlet/product_10051_10051_168934_-1
According to Canon: "The AC Adapter Kit ACK-E4 enables the EOS 1Ds Mark III, EOS 1D Mark III and EOS 1D Mark IV to draw power directly from an AC power source. It is designed to supply uninterrupted power for your camera. Kit includes the AC adapter, DC coupler and power cord."
$80 includes PayPal and shipping; or $75 PayPal Gift.
Any questions just email me (best) or PM me here.
Robert DeCandido PhD = rdcny AT earthlink DOT net