Good luck finding someone dumb enough to pay you $1000 for a yellow tang. Here or on R2R you can find them for $150-250. LFS or online vendors, even the most expensive ones, have them for less than $400Supply and demand, is the relationship between the quantity of a commodity that producers wish to sell at various prices and the quantity that consumers wish to buy. ... The price of a commodity is determined by the interaction of supply and demand in a market.