Note from American Institue of Physics:

35% pre-publication discount on your proceedings Because it is impossible for researchers to attend every relevant conference, AIP would like to ensure that the papers presented at your conference are easily accessible to those who can't attend. Since the Conference Web Site is the most logical place for individuals to access your proceedings information, we invite you to establish a link from your conference's Web Site to AIP's proceedings request page. This request form entitles non-attendees to a 35% pre-publication discount on your proceedings, and also allows attendees to order additional copies. You will find the pre-publication discount order form at: this url