To follow up my post above, I noticed that neither Freestyle nor Samy's list the film online. I went to B&H, and this is what I found: http://www.bhphotovideo.com/c/search...tialSearch=yes.
Every Superia film is listed as "DISCONTINUED" except for Superia 400. (36 and 24 exposure rolls remain, as well as an "Evidence Pack" of 20 rolls with 24 exposures per roll.)
I always get mine over the counter from Samy's or Freestyle, and no one has hipped me to this so far.