I go to small college, 1,100 students and we also do a final pack, or Finalgrams as we call them. Like tiramasu suggested it has great returns for minimal output (minus the organizer.) We get a set of school mailing labels from the registrar. (So they come on those little avery labels.) We get a bus load of envelopes and start stuffing our letter to parents in there, then label and then bulk mail them out. (We can use the school's bulk mail permit.) Parent's send us all the relevant info on their student, along with their check and we put together the final grams and have sisters deliver them. We are residential so we have pretty easy time cause almost everyone is in the dorms. We average a little more than tiramasu, we have been pulling in 2,000+.
We have smaller chapter, 25 women and it really is a managable fundraiser and we have done it with closer to 10 women (we had a ton go abroad) Good luck! let me know if you want more info
Tau Love
Lil E