It was in the mini-sewing section Target has... you know, it is about the size of a piece of poster board, filled with sewing kits, needles, pins, patches and scissors. And THIS
It was I think, $2.00. I've seen fashion tape, but it can be awkward to use (I had lots of practice with it at prom making dresses stay up gravity disagreed with). This stuff comes on a dispenser kinda like those white-out tape things and is perfect for carrying in your purse. I wear a tank top almost always, but in pregnancy, and ESPECIALLY when nursing, things get heavier... and well, uncooperative. Very glad to have it for when even a tank top won't cut it... or when it is just too dang hot to wear one.