it seems to be discontinued, anyone know of a supplier who might have 3-4 44" rolls left?
It has been discontinued for a long time now. I see a shop list in one of the Baltic states that might indicate some stock left.
Alternatives are shown in this spectral plots image. Brown red line is Lumijet (taken from the obsolete papers directory of SpectrumViz) I also compared the surfaces of samples I have and they are close to the Lumijet. You probably are best served with the 290 grams versions and then the ones available in the US.
Met vriendelijke groet, Ernst
http://www.pigment-print.com/spectralplots/spectrumviz_1.htmMarch 2017 update, 750+ inkjet media white spectral plots