As gold prices hit record highs, demand for the precious metal is running hot at Costco. The price of the yellow metal topped 4,000anounceforthefirsttimeonTuesday,andisdrivingstrongsalesforthewholesaleclub.Whilethecompanydidn′tbreakoutexactsalesfiguresfortheproductsinitsfiscalyearearningscallinSeptember,itsaidthecategorycontinuedtobeatopselleronline.Analystspreviouslyestimatedthatthecompanysellsaround200 million of gold and silver each month. Forme ...