Maine Revised Statutes
Part 2: FORM, FORMATION AND READJUSTMENT OF CONTRACT
11 §2-204. Formation in general

§2-204. Formation in general
(1).  A contract for sale of goods may be made in any manner sufficient to show agreement, including conduct by both parties which recognizes the existence of such a contract.  
(2).  An agreement sufficient to constitute a contract for sale may be found even though the moment of its making is undetermined.  
(3).  Even though one or more terms are left open, a contract for sale does not fail for indefiniteness if the parties have intended to make a contract and there is a reasonably certain basis for giving an appropriate remedy.