Hi Ken,
I am not a subscriber to this service, but it may be something of interest to you. Have you looked at:
http://www.insidedirectmail.com/ I remember Dan Kennedy recommending this service. Also look at the archive
http://www.whosmailingwhat.com/ and finally
http://www.majormailers.com/
I know it's not the same effect as receiving hard copy, but it should give you a head start and is, at least, convenient to access.
I would be interested to know if others here subscribe to it? and if so, do they find it useful?
Kind Regards,
Tom
P.S. As I said above, I haven't used it so I'm not recommending it. But I am aware that other people do.