This is a business law question

Gail offers to sell Belinda 1000 boxes of nails, but forget to state the price. All other material terms are present, however, Belinda accepts, but later wants to back out of the deal, arguing that the offer is indefinite. Gail argues that they had a valid contract and Brend a must honor it. Who is correct and why? Assume that at the time of the deal the parties intended to make a contract. Assume also that there was an established market price for the nails in question here