make sure you search through everything on the lair. everything you want to know is in here somewere. but here you go im going to be getting some skulls from here for sure.
i dont know where you can get a 1/6 size predator skull but homemedia4u.com sells a full size predator skull model kit for a decent price( around 40 bucks)
look in the vinyl model kit section.
wait, wer u talking about human skulls.
if u wer,then some party supplies websites may sell some styrofoam skulls or spines.
thats what i would use for trophy skulls