I'm new, but I'll try not to be cheated.
If you're buying, for a Otachie, 5k will do. For a Meragon, 10k will do. For the Ulius, I've seen one sell it for 1.3 mil TU, so for me 1 mil will do although I'd prefer trading it. For the Ginger Chimby, I have no idea, so I'd prefer trading it too. All of them are named except one of the Ulius.
I also have some old common eggs but nobody would want them.