Currently Being ModeratedFeb 11, 2013 1:15 PM (in response to Stewart Ayers)
You should be able to call Apple directly and say that you are wanting to upgrade the server to 10.6 SL server. You may need to pay the full price of what they charged at the time it was released (which is different from what they charge now).
I just recently called to get a replacement 10.6 Snow Leopard server disc because ours got lost and we needed to do a reinstall. I was charged $20 for the replacement discs and shipping so they still have them.