Okla. Stat. tit. 12A, § 12A-2A-205: Firm offers

FIRM OFFERS

An offer by a merchant to lease goods to or from another person

in a signed record that by its terms gives assurance it will be held

open is not revocable, for lack of consideration, during the time

stated or, if no time is stated, for a reasonable time, but in no

event may the period of irrevocability exceed three (3) months. Any

such term of assurance on a form supplied by the offeree must be

separately signed by the offeror.