The Great Lakes do not require a drysuit. We have many members of our club that have dove without one on a regular basis. In fact last year we dove the wreck, "Straits of Mackinac" in a 3mm suit. Water was 75 degrees to 74'. Also, in summer, a 7mm is perfectly acceptable. If in East Lansing, and wanting to become a DM, you best get used to the local diving. If not, better cut the apron strings and go to Thailand, Grand Turk, Tobago etc. Besides, East Lansing probably prepared you for the "spartan" accomodations a life as a DM will afford you.
The best way to have a small fortune in diving is to start with a large one.