If you can't find a textbook on books2go you still have the option of adding that textbook to your wishlist. An email will be sent to you the moment it is posted by a student from your school. To add a textbook to your wishlist you will need the 10 or 13 digit ISBN. A wishlist can be created from your profile.
No. At the moment you will only receive emails for textbooks posted in your school.
Your wishlist is self-managed. Make sure to remove textbooks from your wishlist that you are no longer interested in. You will continue to receive emails until you do so.