On May $1,$ Universal Widget Systems orally agrees to manufacture and deliver $100$ widgets to Justin at a price of $$87\mathrm{.}50$ per widget. Justin intended to use the widgets as component parts for a radio$-$controlled NASCAR car that transforms into a vampire robot that he wants to market for the Christmas season.

On May $20,$ the president of UWS sent an email to Justin stating:

I want to confirm your recent order of $100$ widgets for delivery on July $10$ at a price of $$87\mathrm{.}50$ per widget.

Regards, President Preston Presley

On May $24,$ Justin discovered another supplier of widgets who charged only $$75\mathrm{.}00$ per widget. He sent an email to UWS:

Thanks for your email, but my plans have changed. I no longer require the widgets we agreed on and am cancelling my order. I hope to do business with you in the future.

Signed, Justin

UWS wants to sue Justin for breach of contract. Is the agreement enforceable? Why or why not? Be specific $-$ what laws apply? How?