As a longtime employee, I think the Swiffer Power Mop kit and Ninja Blend Boss are two of the best things to get at Costco right now. Veronica Thatcher As a longtime Costco employee, I always look forward to seeing the new items that arrive on shelves. This month, the warehouse is stocked with tasty meals like a premade spinach salad. The Ninja Blend Boss, which easily converts from a blender to a tumbler, caught my eye. One of my favorite things about working at Costco is seeing all the great