good evening. i m lester holt in tonight for brian. the season of giving has given way to the season of giving back and cashing in on the post christmas bargains. retailers who this year have been especially eager to brand every big day on the shopping calendar are calling this one mega monday. no doubt a lot of weary shoppers are sitting it out. you wouldn t know it by the scenes that played out in malls today. asked to list top reasons for wading back into stores this week 82% in a consumer reports poll listed post holiday sales. around half said redeeming gift cards. nearly a third said returning gifts was a top motivating factor, too. all of which explains why nbc s ron mott has got lots of company in new york s herald square tonight. looks a lot like the day before christmas. reporter: indeed it does, lester. good evening. the doors at macy s have gotten a pretty good workout today as re-energized shoppers are back hoping to bag the biggest bargains. from the west coas