I guess the correct answer is price discrimination, Robinson-Patman Act
As a result of Hurricane Charley, the Green Mountain Lumber Co. decides to charge all Home Depots in Florida $25 per sheet of plywood while all Home Depots outside of Florida pay only $10 per sheet of plywood. The Green Mountain Lumber Co. can be charged with price discrimination, which is illegal under the Robinson-Patman Act.
Price discrimination is the act of charging different consumers different prices for the same product.
The Robinson-Patman Act (1936) makes it unlawful to practice price discrimination, where the effect may substantially lessen competition or help to create a monopoly