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I went in on the Instaprint Kickstarter. $15 for like 4 themed sets of panels. I printed some of them off. Not amazing, but pretty quick and easy. This is 6 panels, each a full sheet of paper plus a sheet of seam pieces to hold things together.
They don't really have instructions and you can interchange the parts around. Like the walls I used were from the "Hallway" and the base from the Alley.