Key TakeawaysCostco saw sales jump 9% in September compared to the same month a year ago.Net sales for the month totaled 24.6billion.Onereasonforthebump,accordingtoCostco,was“abnormalconsumeractivity”duetoportstrikesandHurricaneHelene.Shoppersdidn’tpinchpenniesatCostco(COST)lastmonth.ThepopularwholesalersaidWednesdaythatitsawsalesjump924.6 billion. One reason for the bump in sa ...