Ricko, $500 plus is the price for Coastals at the present time. These are the ones being bought up in big numbers which has made them scarce. I believe Peter has them just for milking. He must have a massive contract for the venom as he need 500.
Inlands/Fierce Snakes are not being snapped up and are readilly available each breeding season. For this reason they only sell for around $200 to $300 for small ones. A 6ft adult may cost around $500 if its a good coloured one, but thats about as expensive as they get.