Uniform Commercial Code (UCC) - Article 2: Primary legislation governing sale of goods in the US, covering contract formation, performance, and remedies. Particularly important for transactions of goods worth $500 or more.

Magnuson-Moss Warranty Act: Federal law that regulates product warranties and protects consumers by requiring clear disclosure of warranty terms.

Federal Trade Commission Act: Federal legislation that governs unfair trade practices and protects consumers from deceptive business practices.

Consumer Product Safety Act: Federal law that establishes safety standards for consumer products and protects the public from unreasonable risks of injury.

State UCC Variations: State-specific modifications to the Uniform Commercial Code that may affect how sales laws are interpreted and applied in different jurisdictions.

State Consumer Protection Laws: Various state-specific laws designed to protect consumers from unfair practices and provide additional rights beyond federal protections.

State Warranty Laws: State-specific laws that govern warranties and may provide additional warranty protections beyond federal requirements.

UN Convention on Contracts (CISG): International treaty governing cross-border sales of goods, applicable unless explicitly excluded in the contract.

Import/Export Regulations: Federal regulations governing international trade, including customs requirements, duties, and trade restrictions.

Industry-Specific Regulations: Specialized regulations such as FDA rules for food/medical products and EPA regulations for environmental compliance, varying by industry sector.