Digital BW, The Print

Hi all. I've got a couple questions after a hiatus from printing:

I vaguely recall reading that Epson premium semimatte is available in
13x19" sheets by a third party. Who is it?

Should I be concerned in choosing a paper that Epson feels is not
worthwhile to sell in small sizes?

Finally, is anyone successfully printing to Semimatte with QTR on a
1280?

Thanks,
-Pieris
digital darkroom blog: http://www.pmb.net/darkroom