A buyer contracts with a computer store to purchase the latest Macbook. The contract provides that the buyer will pick up the computer and pay $1800 on November 1. On November 1, the buyer unjustifiably breaches the contract. The computer store then sells the specific computer to another customer for $1800. The computer store can buy an unlimited number of the same Macbook from Apple.

What damages can the computer store get from the buyer? Explain.