Can't (or are unwilling to) spring for a spare Ghost Gaff deck? It's never a bad idea to keep spares around.
It's a rare person that will use every gaff card in any given gaff deck - good luck finding a trading partner. I'm pretty fond of my gaffs, including those kings.
How do you use them? Transformations, Kannibal Kards, etc.?
Another possibility - try E customer service. They might be willing to offer you the kings from a spare gaff deck lying around. Couldn't hurt to ask.