I have a fairly new muni frame for sale. It’s custom built from Joe Rowing of England. It fits any 3.0" tire with good clearance. Frame is 4130 steel, powder coated black with a few minor scratches. Only been ridden for 2 months. Price is $200 (includes ground shipping). Frame is ~$300 new
Check out http://pedal.me.uk/ for photos and info about the frame and builder.