I run throgh tee shirts with some regularity and going to the mall to sort through el cheapo sore brands, cotton poly mixes, dumb not-sales (buy 6 and get 3 half price!!!) and then dealing with the line is too painful. I order a pack or two  every six months and it's one less thing to worry about. And with prime i save money, especially when you factor in the cost of a trip to the mall