I run a subscription MGB-only for-sale ad listings database. I'm not going to "spam" you by pitching for the database, but you might be interested in looking at the overall statistics (and the Buyer's Guide and the Seller's Guide) in the free area of the site.

The statistics imply that MGB prices are healthy in our shaky economy and that there is a very lively market in buying and selling them in North America. See for yourself if you like: http://www.naspecmgb.com (http://www.naspecmgb.com/)

Cheers!

-Desmond