I have a red-tagged one that is completely in parts and was rejected for "absolutely any aviation use whatsoever" by Pfifer that I will part with for $50,000.00.
Just kidding about the price. They are indeed rare. Have you priced an overhaul? What plane do you have?
I would post that on the vikingchat forum, the older vikes have them and I know those get parted out from time to time. Also, Wentworth had some vikings.