murray cods are hard to find in newy. i managed to get a very small one once but it refused to eat even live guppy juviniles. there are alot of sleepy cod here which are similar but smaller and less territorial (and are quite distant relatives).
only ever seen peacock eels for $20 except for online
an arapaima gigias in oz would probably be a million dollars. literally.
true pirahnas probably a few hundred up to $1000 each. red hook dollars wholesale price is around $60
A pedigree Koi is much MUCH more pricey than even asian aro ...well, at least in Thailand (and here i suppose since our stuff comes through there).
I have seen pedigree 1,000,000+ THB Koi (that is 28,000 USD at current 35 THB exchange rate). None of the asian aros would cost that much (unless you are in Ozland or something)