Gerald, there is a Donor Program. There is a stickied thread on the top of this forum called Donar Program something or other. If you click it and scroll down to the bottom, that is the master list of donor corals as of Friday the 13th. I'll be adding on to that list later this week.
DTKing, occassionally this happens, and then they come out later and are fine. But always make sure that there isn't a reason why they are doing that. Check to make sure that there isn't any irrtants like crabs picking on them or clownfish hosting in them to cause them to close up. Also, double check for nudibranchs. It is pretty rare in the hobby to see the GSP eating kind, but they are out there. If you do find some, I know someone that needs them for research. Also, always make sure that your water parameters are okay. Check pH, Calcium, Alkalinity, and Magnesium. If the parameters are fine and you can't find something bothering them, give it time and they will most likely come back out.