Hey guys!
In my attempt to find my textbooks for the eDGe I have found some pretty good online textbook sites. Most of them you have to pay for, but it's nothing unreasonable, and in some cases you'll have to see if your school or professor has a membership.

http://degreedirectory.org/articles/...ks_Online.html
I was going to post most of these individually anyways, but then I found this article and they covered things better than I ever could.