Some more info would be helpful, but aren't you near the Grand Rapids area? I remember about ten years ago, heading to Muskegon with a buddy of mine, we got off the freeway on some state rt D-something (maybe 26, 28) and headed east and came across this huge group of cars just out there. I'm sure it was a yard, but there was no offices, cars on both sides of the dirt road, in the woods, no fences, etc. We didn't find anyone and had to leave (scheduled appt in Muskegon) and I haven't been back since. I just remember it was a dirt road maybe 10-20 miles south of Muskegon, east of the freeway. That should keep you busy for a Saturday at this time of the year.
If you could give us a better description of what you are looking for, I KNOW someone here probably has at least one, and parts of another "out back"
Bruce