|I haven't spent a lot of time looking around, swapping, or selling, but it seems to me that about half the new price is a good starting point for used diapers. If they weren't used much, a bit more, if they are in slightly less than average condition, I'd probably assume a bit less than half. Being used for four children with a newborn-sized diaper isn't like being used for four children for the OS, for instance, since the usage window isn't that long. I think that if you can look at them and honestly say that you would use them on another child and expect them to perform well, then I'd feel good about selling them. Because of the wear issues, make the price a little less than half, and you might really make someone's day.