Refer to this link for pricing details : http://www.adobe.com/products/digital-publishing-suite-family.html?promoid=JOLIU
Rough Pricing exclusive of taxes :
DPS Single Edition (One time use) : $ 395
DPS Professional Edition : $495 Per/Month
DPS Enterprise : Fill out this form for details : http://response.adobesystemsinc.com/content/publishing_suite
Distribution though Adobe content viewer is free, however each person will have to install Adobe content viewer and view folio on it. Even unpublished folios would be available on it.