(NEWSER) - Manufacturers have gone on the offensive to stop discounters from selling their products for less than the minimum advertised price they set, reports the Wall Street Journal. But companies like eBay and Costco are pushing for laws to ban the minimum prices. Some retailers, like Circuit City, use workarounds to undercut the "MAP," or minimum advertised price. The Supreme Court has ruled that MAPs do not constitute an antitrust violation. More»