Great Lakes Cruising Club (GLCC)
The GLCC, based in Chicago has the best port and cruising guides for the Great Lakes. All of the other guides are derived from their work. And, their exhaustive set includes brief guides and good logs of the Erie Canal, and the Great Loop.
This is not a cheap alternative, (you have to join the club, and buy the documents) but the cost is lower than the charts (paper, electronic, or both) you will want for the trip you plan. And they maintain a boaters view of every port and passage, written by other boaters who know them well. None of the other guides will really fill you in on cruising the St. Clair and Detriot Rivers, for instance.
David
Lady Lillie