Uniform Commercial Code (UCC): Primary federal law governing sales transactions, particularly Article 2 which regulates the sale of goods and establishes fundamental contract principles

Interstate Commerce Regulations: Federal regulations governing transactions that cross state lines, including rules for interstate sales and commerce

Federal Consumer Protection Laws: Federal regulations designed to protect consumer rights, prevent fraud, and ensure fair business practices in sales transactions

FTC Regulations: Federal Trade Commission rules governing fair trade practices, advertising, and consumer protection in sales transactions

Truth in Lending Act: Federal law requiring disclosure of credit terms and costs in consumer credit transactions, applicable if financing is involved

State Contract Laws: State-specific regulations governing contract formation, enforcement, and remedies, which may vary by jurisdiction

State Consumer Protection Statutes: State-level laws protecting consumer rights and regulating business practices, which may provide additional protections beyond federal law

State Real Estate Laws: State-specific regulations governing real property transactions, if the pre-sale agreement involves real estate

State UCC Modifications: State-specific modifications to the Uniform Commercial Code that may affect sales transactions in that jurisdiction

Statute of Frauds: Legal doctrine requiring certain contracts to be in writing to be enforceable, particularly relevant for sales of goods over $500

Contract Formation Principles: Legal requirements for valid contract formation including offer, acceptance, consideration, and mutual intent

Good Faith and Fair Dealing: Legal requirement that parties act honestly and fairly in contract formation and performance

Warranty Laws: Laws governing express and implied warranties in sales transactions, including product quality and fitness for purpose

Industry-Specific Regulations: Specialized rules and requirements that apply to particular industries or types of transactions

Documentation Requirements: Legal requirements for written documentation, disclosures, and recording of sales agreements