World’s End Publishing has a free-to-download rules set for a TNT warband (which the full rules are coming soon), the Mutant Cannibals.
From the release:
Just in time for Halloween, World’s End Publishing is proud to present an entirely free and playable warband for This Is Not a Test (TNT). Based on such movies as the Devil’s Rejects, The Hills Have Eyes, and the Texas Chainsaw Massacre, among many others, the Mutant Cannibal warband is a dark and twisted take on wasteland mutants. Though TNT is still waiting to be released, this free download gives insight into the core of the TNT warbands and their design. Enjoy.