Got bargains? More than 4 in 10 consumers said they plan to shop at a dollar store during this holiday season, according to a recent survey conducted by The NPD Group.   NPD’s Checkout, a receipt mining service, reveals that dollar stores, like Dollar General, Dollar Tree, and Family Dollar, are picking up in popularity, with the number of buyers increasing 3 percent in the 12 months ending October 2018, compared to last year.   “Dollar stores’ old bargain-based reputation is now more about ...