I'm looking for a company in the lower Michigan/Ohio area that buys
used motorcycles.  They offer a priliminary price based on the sellers
description, then drive to your residence to view the motorcycle at
which point they then offer the final price.  I've sold two
motorcycles to them in the past, but cannot find their name anywhere.

Dear outdoorsman,

I am quite sure that "Motorcycles International" in Temperance,
Michigan is the company you are looking for. The description of their
services ("Just tell us about the motorcycle that you want to sell and
we'll respond with a general quote to buy your used motorcycle.") and
their location ("We're in southeast lower Michigan and near the Ohio
border.") fits perfectly with what you wrote:
http://www.sellusyourbike.com/easy-bike-sale.html

So here is full contact information:

Motorcycles International
10900 Secor Road
Temperance, MI 48182
--
Phone: 734-856-8660
Toll Free: 800-963-9216
E-Mail: sales@sellusyourbike.com
Website: http://www.sellusyourbike.com/


Search terms used:
"we buy used motorcycles" oh
://www.google.de/search?hl=de&ie=UTF-8&newwindow=1&q=%22we+buy+used+motorcycles%22+oh&btnG=Suche&meta=
"we buy used motorcycles" mi
://www.google.de/search?hl=de&ie=UTF-8&newwindow=1&q=%22we+buy+used+motorcycles%22+mi&btnG=Suche&meta=


Hope this is what you were looking for!
Regards,
Scriptor

That's the place.  I'm amazed at the speed with which you answered.