ask spainard see if he can get you a group together, i got lucky with my egg though after the the update on ks99....all freaken camped that thing for over 5 months. or ask orn
On Lakshmi, several of my friends have sold Blue Pondweed (which is the pop item for Adamantoise; he only has a small chance at dropping a pop item for Aspidochelone...) for 700k to 1 million gil. Given that, I'd say the prices for Egg/Tongue/Beard are probably going to be ridiculous.