I just got my 24x30 Fuji Dup film from zzmedical which I SPECIFICALLY asked if it was 24 x30 INCHES and noticed two things which immediately irritated the crap out of me:
1. It's 24x30 centimeters.
2. it came with a note saying they were discontinuing it.
so there are other sources of duplicating film (including ultrafine, the only supplied of 20x24 INCH dup film) but I'm rather worried that its all rebadged fuji, which would suck.