Source of more accurate/detailed topo information?

[sketchy]

Does anyone have a source for more accurate topographic information than Google Earth. I am working with a site for a client that has some reasonably steep slopes and the capture from GE doesn't seem accurate/detailed enough for my needs.

I did search these forums but couldn't find anything along these lines, my apologies if I missed it.

A free solution is always lovely but I am willing to pay for something short of a full survey by a survey crew.