Mo. Rev. Stat. § 400.2-707: "Person in the position of a seller".

(1) A "person in the position of a seller" includes as against a principal an agent who has paid or become responsible for the price of goods on behalf of his principal or anyone who otherwise holds a security interest or other right in goods similar to that of a seller.

(2) A person in the position of a seller may as provided in this article withhold or stop delivery (section 400.2-705) and resell (section 400.2-706) and recover incidental damages (section 400.2-710).