My go-tos are Christopher Moore (Bloodsucking Fiends, You Suck, Bite Me, etc.) and Chuck Palahniuk (Fight Club, Choke, Damned, etc.). While neither of these authors writes in the same style or genres that SK does, they both venture to the "dark side" and both do it with humor. Moore is more droll in his humor while Palahniuk is just bizarre. Both are very good writers though, in my opinion.