My six inch Banjar Arow cost about 400$, and that's my most expensive so far. I was almost tempted by a very "cheap" RTG Arow a few weeks ago. 15 inches long it was about 1500US$. Although it was cheap for an RTG it was too much for me to spend, I'd rather go on holiday
200$ on a yellow tail purple tang. Which I ended up giving to a regular customer when i decided to tear down my saltwater and go back to FW. They still have him/her =D.
Fresh water was a Zebra Pleco about 8 years ago 150$.. I miss that fish.