I don't know if this would carry over to this issue or not, probably not, as it's a First Amendment issue, BUT, it would be applicable, I think, in cases of Radio Shack, etc. IF they were to fight the FBI or anyone wanting their database info. Here's what one independent bookstore in Colorado did: (BTW, they do mail order and are really good!)

Tattered Cover Wins One for Free Speech
(and indie bookstores)!

by Eric Wallenstein

In a decision that certainly has independent booksellers and free speech advocates rejoicing nationwide, The Colorado Supreme Court ruled on April 8 that Denver's Tattered Cover Book Store does not have to turn over customer records that had been requested by local law enforcement officials. The officials sought to use the information as evidence in a case involving the manufacture of methamphetamines.

Chris Finan, president of the American Booksellers Foundation for Free Expression (ABFFE), said the decision "strongly affirms the fact that protecting the privacy of bookstore records is essential to preserve free speech." Of course, not only was the judgement a boon to free speech, but also a testament to the efforts of Tattered Cover, an (ahem) independent bookstore that spent two years working on the case. Our congratulations go out to Tattered Cover, ABFFE, and all of those who helped out in this campaign to protect customers' privacy in bookstores.