Looking to find the best sites for textbook ebooks. I haven't been around in a while and most the sites I used aren't working or don't have anything.

Looking specifically for:
978-0-205-18093-6 West:Narrative History Vol I

978-1-56324-599-2 Spartacus

978-1-319-09215-3 St. Martins Handbook

978-1-323-15217-1 Longman Reader