clint, you wanting crabs as food for the mantis? or you starting a crab only tank?
if crab only, let me know, my lfs here has some red hairy crabs, that have anemones on thier shell. it's not aptaisa though. but it's a small anemone that has a symbiotic relationship with the crab. i think they were like 7 bucks. i could pick one up and ship to ya if you like.
here's a pic of what mine looked like, before i returned him.
he also regularly carries anemone (porcelain) crabs as well.