Seek and ye shall find. Some of the books we recommend so often are out there now. I've recentl found "Not Just Friends", "In the Shadows of the Net" and "How to Help Your Spouse Heal from Your Affair"
With the advent of Cloud servers, it's much easier to find these without using a risky peer to peer (P2P) server. Run a Google search with the title of the book you're seeking and add pdf on the end. Best of luck!