Advertising and marketing; Classified advertising services; On-line retail store services featuring a wide variety of consumer products; On-line retail store services featuring home and building supplies and products; On-line retail store services featuring used home and building supplies and products; On-line retail store services featuring used home improvement supplies; On-line retail store services featuring household goods, appliances, and building and home improvement materials; Providing a searchable on-line advertising website and guide featuring the goods and services of other vendors via the Internet; Retail store services featuring a wide variety of consumer products; Provision of an on-line marketplace for buyers and sellers of a wide variety of consumer products; Provision of an on-line marketplace for buyers and sellers of used home and building supplies and products; Provision of an on-line marketplace for buyers and sellers of household goods, appliances, and building and home improvement materials; Provision of an online marketplace for buyers and sellers of goods and services