Cooperative purchasing is something I've done a bit of on a relatively small scale, say to find one or two people to split a 500 sheet box of Azo gr. 3, before it was available in 100-sheet boxes from Michael and Paula, and before I was quite ready to commit that kind of cash to Azo. Occasionally on the LF forum, people have announced plans to make a minimum order of a certain film in a banquet size, and those seem to have worked well. I'm considering doing the same at some point for Tri-X in 11x14", if Kodak will still do it, and if new Tri-X (which I haven't tried yet) is as good as old TXT (which I've bought from B&H in other sizes as recently as a month ago).