Shirley,
You are right to a point. Good Will does not put machines out for sale, but they don't use eBay. They have their own on line auction site.
http://shopgoodwill.com/
Here is the direct link to the sewing machine search:
http://www.shopgoodwill.com/search/S...&showthumbs=on
We have been buying sewing machines and other goodies from there since last October and I have noticed a steady increase in prices of the sold machines. Especially the Japanese ZZ machines like my Alden and some of the others with built in and cam driven decorative stitches. Those seem to be quite popular now.
Enjoy.
Joe