I need to print a large poster about 46" x 68". I bought a poster of similar size online for $15. However, I've looked and asked around and if I want to make one of the same size the smaller price I've found was $100 for the print job. How can this be? I need it to be black and white, doesn't have to be super quality, just has to be really big. Does anyone know a place that could print this for me at a reasonable price (say $40 or less)?