HRS §490:2-204
How a sales contract can be formed
A contract to sell goods can be made in any way that shows both sides agree, even by their actions. It counts as a contract even if you can't say exactly when it was made. Missing details don't kill the deal if both sides meant to contract and a fair remedy can be figured out.
buyers
The statute, as written — 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 sales 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.
LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.