We knew you'd be interested in this, so we want to answer it. You can save the Aerial, Topo, and Tiger maps to an image file, and that file can be imported into AutoCAD. However the image will not be scaled properly, and you will have to change the image to the proper scale.

 

This is not particularly easy. You must find known points on the map, measure the distance in (ACAD units) between them, and compare it to their actual distance. Then adjust the map size to match by changing the scale of it's insertion. 

 

You can also plot the points from the grid into AutoCAD, and try scaling and aligning the bitmap to line up with the plotted points.

 

If this is done carefully, you can come up with a fair resemblance of the map image at true scale in AutoCAD. However the quality of the image may degrade, depending on how much it is scaled.