We can work out a kind of rolling deadline once we get the list together, since the prints won't be collected all at once, but rather, each person will add a print when it comes around to them the first time around, and when it comes a second time, they'll take the first print out and put in a new one. We'll try to arrange the list as best we can to keep the postage costs reasonable, and so that those who can't afford a heavy postage burden won't get stuck with one where possible.