==Formats==
''Ghosts I–IV'' was made available in six different formats:
*A free 320Kbps DRM-free MP3 download consisting of ''Ghosts I'' only and a JPG file containing the cover art [http://ghosts.nin.com/images/popup_product_0download.jpg] *DRM-free download in consumers' choice of format (MP3/FLAC/ALAC), 40-page PDF booklet, and digital extras (wallpapers, avatars, banners) [http://ghosts.nin.com/images/popup_product_5download.jpg] *2-CD set in custom digipak with 16-page booklet [http://ghosts.nin.com/images/popup_product_2cd.jpg](priced at $10) *4XLP vinyl edition, which was made available in Australia and Japan on April 5, 2008, and in the US, UK, and most of Europe on April 8, 2008. [http://(this was not made available through ghosts.nin.com/main/faq]) *Deluxe Edition(priced at $75), which includes 2 CDs, a DVD-ROM of [[Multitracks|multitrack]] files, Blu-ray Disc of the album featuring a 96khz/24bit digital mix of the album as well as a slideshow, and hardcover 48-page booklet in a black fabric slipcase [http://ghosts.nin.com/images/popup_product_deluxe.jpg] *Ultra-Deluxe Limited Edition(priced at $300), which includes everything in the Deluxe Edition, as well as the album on a 4-part 180 gram vinyl edition and two Giclée prints(one being the image used on the album cover, the other being one of eight other images. ) This version is limited to 2500 copies, each of which is numbered and signed by Reznor himself. Although it was initially expected that this edition would take a while to sell out, it was announced on March 4, 2008 that all 2500 copies had been sold. [http://ghosts.nin.com/images/popup_product_ultradeluxe.jpg]
The Standard 2-CD edition, Deluxe Edition, and Ultra-Deluxe Limited Edition also included an immediate download of the album in the consumers' choice of format. The Deluxe Edition and Ultra-Deluxe Limited Edition were both shipped May 1, 2008.
===Pricing===
The pricing of the releases, as listed on ghosts.nin.com, was as follows:
*Digital download - $5
*2-CD digipak - $10
*Deluxe Edition - $75
*Ultra-Deluxe Edition - $300
Note: the vinyl version was never sold on the site.
==Inspiration==