I hate to be the bearer of bad news but Century Camera is also closed down. Your best bets are:
http://www.cameramartinc.com/scripts...art/contact.pl and http://www.woodwardcamera.com/
JD probably knows Detroit a lot better than I do and I'm sure he'll have wonderful suggestions. I like to shoot in the Detroit area but have only done it a handful of times and usually at night (with someone else). I live about 45 miles (72 km) from D-town.
Attached is a lousy scan of Detroit I shot from Windsor, Ontario (the other side of the Detroit River).