I just order my stuff from Sal. However, there is/was a distributer near me that I called once. He was out of Z6 which was all I needed at the time. I haven't tried calling back since. I e-mailed Sal last year and he gave me the contact.
Ray Price
54124 Salem Drive
Shelby Township, MI 48316
(248)650-2103
You should e-mail Sal and ask if ther are any distributers in Detroit/Windsor area just to confirm the guy is still a distributer. Shelby Twp is about 45 minues from the bridge/tunnel, FWIW.
I only got about 8 coats of Z2 out of my first bottle. Way too thick. I have been using a lot less now. How many coats do I think I will get? 25 maybe more. Hard to keep track of multiple vehicles with varying amounts of Z2 and Z5.
And like Nick said, clay bar will really help with bugs as well as tree sap and less obvious paint contaminants.