My Dell 2007FP (a 20" 4:3 aspect monitor) has composite video (and Y/C) video inputs - you ain't having mine though
Look on ebay - you can get one for ~£50 ....
Its also a damn fine computer monitor (as in VGA and DVI-A) ..... so lots of other uses.
Does it support proper 50 Hz refresh rate?
I have a similar Philips 20"-er (MVA panel, 1600 x 1200, 4:3, composite+y/c input plus the usual VGA + DVI) and while it will accept a 50 Hz signal on the composite/y-c inputs it will display it "upconverted" to 60 Hz, totally killing smooth animation/scrolling.
Damn fine monitor too otherwise.