It’s the kind of thing you might expect from a Matt Fraction comic — although I would have guessed it would have been connected to Sex Criminals. Still, this one makes more sense, story-wise; retailers who order 10 or more copies of Satellite Sam #8, by Fraction and artist Howard Chaykin, will receive their very own Satellite Sam Tijuana Bible.
If you aren’t familiar with the term, Tijuana bibles were small pornographic comic books that were popular during the Great Depression era. Typically they parodied comic strips, such as Blondie, Popeye or Dick Tracy (that last one pretty much writes itself), or they played off a popular dirty joke. You can find many of them here (very much NSFW). The story in Satellite Sam #8 features a Tijuana starring the cast of the Satellite Sam TV serial.