Since Timing is critical, I would give the people who have left to pay until mid day or early evening on Sunday to pay and then open the ones not payed for to anyone that wantsthem and can pay immediately. I know that this is not normal coop practice but this is not a normal coop and the people who became members were told that the payment needed to be made quickly. It is not fair to the members that paid promptly to lose out because a few fell asleep at the wheel.