BHA is now available free on Getty Website
Good news from the Getty on the status of BHA:
"As of April 1, 2010, the Bibliography of the History of Art (BHA) will be available free of charge on the Getty Web site at http://library.getty.edu/bha. Free Web access to BHA is an advantage not only to all traditional users of the database but also to such potential users as institutions in developing countries and independent scholars worldwide, who until now have been unable to afford access to the BHA."
For more information, see the Getty website.