Yikes! I called all 3 local places listed and the costs were $55-$78 (lot charge what ever that means).
Whether they do one, or ten the price will be the same. I'm guess so long as it fits in a certain rack, or tank. Something of that nature anyway.
You mentioned others needing the castings as well. Get a group together, buy as many as you need plus some spares and get them dipped.
