Not sure exactly what you are looking for (your intended use would better help with suggestions).
For raw "elevation" data nothing beats the USGS Topographical maps
. These are exceedingly detailed.
may be another resource for you. Run your cursor along a highway and see it's elevation and layout.
If getting the lowdown on hills are your concern then the Mountain Directory West for Truckers, RV, and Motorhome Drivers (Paperback)
and the one for the east
are you best bets. Amazon links given, other sources for them are available too.