In order, they are Achilles tang, Gem tang, Peppermint Dwarf Angel, and Blue Striped Tamarin Wrasse female.
The Achilles tang is roughly $200 and up (and the cheapest fish on the list). The Wrasse is the next cheapest at about $1000, then the Gem Tang at about $3500 and up, and then the primo ultimate expensive fish, the Peppermint Angel at $20,000 and up. The angel is very rare to find in the aquarium trade. I think there was one or two available in the 90's in the US, but that was the last time they were even available on this continent.