said by haggishelper:Try Microcenter.com (a computer store). I remember seeing monitors in the 40+" range having both HDMI and DVI inputs. You might be able to find these larger sizes online. Biggest might be 50" for 52-70 inch range they're going to be HDTVs of various kinds.
When I was in the market for a new TV several years ago the Plasma TVs were all the rage for picture quality etc... I wanted to save money and just buy a monitor with out the tuner integrated. I was unable to purchase this type of item for the size that I wanted to get. If a customer does have other devices that provide content why not sell a bare-bones TV/monitor in the larger sizes.