This subchapter does not apply to:
1. Public auctions. Liquidation sales by public auction of not more than 3 days duration conducted by a licensed auctioneer;
2. Sheriffs' sales. Sales conducted or made by sheriffs, deputy sheriffs, constables, collectors of taxes, executors, administrators, guardians, conservators, receivers, assignees under voluntary assignments for the benefit of creditors or insurers; or
3. Sale of personal property. Sales by any other person required by law to sell personal property.