X-link to the DRM-free thread for a Humble Bundle addition:
Last week's
Humble Book Bundle Puzzles presented by Lone Shark Games & Friends, containing mostly crossword puzzle books, has added to the $15 top tier an audiobook novel (text version already in the middle tier) narrated by Star Trek actor Wil Wheaton, if you happen to be a fan of his and/or were wondering whether or not you wanted to bump up your pledge.
ETA: apparently there may also be a mini-album of the soundtrack music included as well, at least according to HB's description blurb.
ETA 2: There are three soundtrack albums included with the audiobook download, plus the album artwork and a PDF liner notes booklet for one of them, and the novel itself comes in two versions, linear and non-linear, since it's one of those Choose Your Own Adventure types of stories. So, you seem to be getting good value for money what with everything that's been thrown in as from the novel's dedicated website, it seems that the main soundtrack is usually sold separately.