There are two Sandman Slim novels by Richard Kadrey available on the cheap. You can download Aloha From Hell for 1.99$ here and Kill the Dead for the same price here.
Here's the blurb for Aloha From Hell:
All hail Sandman Slim, author Richard Kadrey’s ultra-extreme anti-hero and recent escapee from Lucifer’s overheated Underworld playground. Legendary author William Gibson (Neuromancer) called Kadrey’s first deliciously twisted Slim adventure “an addictively satisfying, deeply amusing, dirty-ass masterpiece,” and in number three, Aloha from Hell, the ruthless avenger, a.k.a. Stark, finds himself trapped in the middle of a war between Heaven and Hell. With God on vacation, the Devil nosing around in Paradise, and an insane serial killer doing serious damage on Earth, Stark/Slim is ready to unleash some more adrenaline-surging, edgy and violent supernatural mayhem—and even pay another visit to Hell if necessary—which is great news for fans of Jim Butcher, Warren Ellis, Charlaine Harris, Kim Harrison, and Simon R. Green.
And here's the blurb for Kill the Dead:
Sandman Slim is back from Hell. After wreaking unholy havoc in author Richard Kadrey’s resoundingly acclaimed Sandman Slim, the demon-slaying anti-hero and half-angel fugitive from the underworld returns in a brutally funny, eye-poppingly inventive, and totally addicting follow-up, Kill the Dead. If you’re a fan of Buffy and Jim Butcher, Christopher Moore, Neil Gaiman, and Warren Ellis, or you dig the dark urban fantasy vibe of Charlaine Harris, Kim Harrison, and Simon Green, you’ll cheer Lucifer’s onetime personal assassin as he signs on as his ex-boss’ Hollywood bodyguard…and takes on the zombie apocalypse almost single-handedly.