Another reason for the large disparity in pricing may have more to do with the internal current production load of the print operation you are requesting pricing from. Sometimes, if they are slammed, and, production is heavy, they may give a higher quote. The thought process there is "if we don't get it, that's ok, we'd have difficulty in figuring out where to squeeze it in anyway. If we do get it, at least we're damn sure going to make good money on it". Conversely, if production is light and they are not busy, they may give a lower price to increase the probability of getting the job to keep the printers running.