I don't know if it still holds true now a days, but way back when I worked in a LFS ... the difference in price with the Red Sea stuff vs the same species from the Pacific was the fact the Red Sea stuff was never collected via cyanide where at the time, that was a normal collection technique in certain locations in the Pacific. So you were paying more to make sure the fish wasn't poisoned on collection since cyanide collected fish often had health issues and didn't live as long.