I love these! They're so easy to use. No need to measure just pop one in the washing machine and go! I can't remember now where I got them but I'm sure you can find them at Target, Walmart, and/or local grocery stores. They smell great too! That's a big thing for me, I'm quite sensitive to smells and if I'm going to be wearing something all day I need it to smell good, if it has a strong scent, or not smell at all.