The Uniform Commercial Code provides a number of legal rules designed to fill in gaps left in contracts--and is available online.

§ 2-305. Open Price Term.

§ 2-306. Output, Requirements and Exclusive Dealings.

§ 2-307. Delivery in Single Lot or Several Lots.

§ 2-308. Absence of Specified Place for Delivery.

§ 2-309. Absence of Specific Time Provisions; Notice of Termination.

§ 2-310. Open Time for Payment or Running of Credit; Authority to Ship Under Reservation.

§ 2-509. Risk of Loss in the Absence of Breach.

§ 2-504. Shipment by Seller.