Hardware Store sent mailers around town that said, "This Saturday only, riding lawn mowers starting at $400." Buyer arrived at Hardware Store early on Saturday morning and told the manager, "Here is my $400. I want one of those riding lawn mowers that you have on sale." The manager replied that Hardware Store did not actually have any riding lawn mowers for $400.

Buyer contends that he was ready, willing, and able to make the purchase and that his acceptance of Hardware Store's offer created an enforceable contract. Is Buyer correct?