If you make enough phone calls, you will find someone who will be willing to take these animals - be polite but be persistent. If someone can't help, then ask them to give you the name of someone who might be able to. Don't get off the phone without getting at least one name. There's a network of rescue people in every town and they generally know each other. If possible, you should also offer a donation as an incentive.
Most rescue organizations are cash-poor and always have more animals than they can handle.
A donation might make the difference between a yes and a no. By trying to dump it in their lap, you could lose any cooperation they may have given you. Unfortunately, they hear the same story too many times in a day and your willingness to work with them might make the difference between whether they'll take this animal or not. However, please note that not all rescuers take great care of the animals. Before leaving an animal with them, you should check out their facilities and take a look at the animals in their care.