It looks like Glidden doesn't make Blue Phlox any more. Their colors have all been renamed. There are odd sites that put up an HTML color approximation of paint chips, such as the following (which seems to give a catalog number for Blue Phlox):
http://www.myperfectcolor.com/en/color/88063_Glidden-58BB33270-Blue-Phlox
http://www.color-swatches.com/glidden/blue-phlox/58bb-33-270/swatch.html
Pure Periwinkle is a pretty close replacement for Blue Phlox though.
