Atlanta--Healtheon/WebMD and San Diego-based Medibuy.com have formed a far-reaching marketing deal aimed at physicians. Healtheon/WebMD and Medibuy.com will create a health care supply electronic-procurement portal that will be connected to Medibuy.com's site (www.medibuy.com). Healtheon/WebMD will also promote the portal to its member doctors. Medibuy.com will pay Healtheon/WebMD $45 million over the next three years under the deal. Additionally, Healtheon/WebMD will receive an undisclosed percentage of all transactions generated over the portal.