(re: Swapping/Buying/Finding) This really is not on the legal side. Old game lovers (like myself) have been doing this for years. Try
Link: http://www.abandonware-forums.org(http://www.abandonware-forums.org)
… they can help if the game is no longer sold. I myself am on there under the name “avatar_58”.
Sierra games, however, are not shared as they are very protective of their games.