Need a better price for manifold and riser

[rb437]

I have noticed that I have been losing coolant from the fresh water side of the system and pressure testing shows that the system is not holding pressure. I haven't identified a specific leak but Spareparts posted some notes on this engine a couple of years ago that identified the gasket between the manifold and riser as a common problem. I can't find any external leaks so I pulled the riser off to check the gasket between the manifold and riser. There is corrosion up to the bolt hole closest to the #4 cylinder and that bolt brought most of the threads from the aluminum manifold with it when it came out. I hoped to find only a bad gasket when I took this apart but obviously that was way to optimistic. So now I'm looking for a good price on a manifold and riser. The cheapest I've found so far is $750.00 for the manifold and $150.00 for the riser, plus shipping. Anyone got a line on something cheaper? It seems that this is not a common part anymore and they're expensive.