Canon 1Ds Mark III is out of stock since 15th Jan 2011 / Not Available along with the 1Ds and 1Ds2 at http://shop.usa.canon.com/, Click here to see
What canon support say about 1Ds Mark IV (thanks to my friend for sending this info) “At this moment there is no information available regarding a new product announcement in this category. Please keep in mind, however, that Canon continuously reviews its product lineup, and as new products are introduced, existing models are often taken out of production. We recommend you check our website.”
Third and the last – Vincent Laforet cleaning all the old DSLR camera and Lenses made by canon(including 1Ds Mark III). Click here to see