Providing a trade-in programs for used mobile computers, barcode scanners, printers, automatic tagging, labels and tapes, and RFID readers and tags of others; providing consumer product information via the Internet or other communications networks; retail, wholesale and online store services featuring mobile computers, barcode scanners, printers, automatic tagging, labels and tapes, as well as RFID readers and tags; advertising; providing product sales information; providing information regar...