LiDAR data collected in 2011 is available for free on the MnGEO (Minnesota Geospatial Information Office) ftp site.
The elevation data is available in geodatabase, las and laz files in regular tiles. A map of the tiles is available.
For more information about LiDAR Elevation Data for Minnesota visit the MnGEO Elevation website.
All data is subject to the 
Dakota County Data Agreement.