Here are scans of the 5 episode posters from Telltale's Sam & Max: The Devil's Playhouse episodes.
Poster design by Stephen Whetstine and shared with permission. The artwork for The City that Dares Not Sleep drawn by Steve Purcell.
The posters were originally 17x11", but were scanned on an A3 scanner and thus missing a couple of millimetres in length, but otherwise very close to the A3 paper format.
The Penal Zone
The Tomb of Sammun-Mak
They Stole Max's Brain!
Beyond the Alley of the Dolls
The City that Dares Not Sleep