Uniform Commercial Code (UCC): Primary legislation governing sales of goods and secured transactions. Key sections include Article 2 (Sale of Goods) and Article 9 (Secured Transactions). Essential for transactions involving personal property worth more than $500.

State-Specific Contract Laws: Local state requirements for contract formation, statute of frauds, and state-specific modifications to the UCC that may affect the agreement's validity and enforcement.

Consumer Protection Laws: Federal and state regulations including the Federal Trade Commission Act, state consumer protection statutes, and Magnuson-Moss Warranty Act for consumer protection in sales transactions.

Product Safety Laws: Regulations including the Consumer Product Safety Act and state-specific safety regulations that ensure the safety and compliance of products being sold.

Title and Transfer Laws: State-specific regulations governing the transfer of title and any applicable registration requirements for the personal property being sold.

Tax Laws: Federal, state, and local tax requirements including sales tax obligations and other tax implications related to the purchase transaction.

Fair Credit Laws: Regulations including Truth in Lending Act and Equal Credit Opportunity Act that apply when financing is part of the purchase agreement.

Electronic Signatures Laws: E-SIGN Act and Uniform Electronic Transactions Act (UETA) governing the validity and enforceability of electronic signatures and records in the agreement.