Geoff Zeiss notes on his
blog Autodesk has deals with data providers to offer up
discounts on data. Whose data? DigitalGlobe (via its acquisition GlobExplorer), NAVTEQ (via ADCI), Intermap and Weatherbug (that link was broken when I tried it). Offers vary - DigitalGlobe offers a limited 14 day trial and Intermap a percentage discount. Worth a look if you are in the market.
The title of offer's Web page: High Resolution Earth Images for AutoCAD Map 3D. (Might want to update that since there's more than imagery and the data are for other products, too.)