Ghungru may be purchased in India, via friends or family, or online. KDT recommends purchasing ghungru from http://www.dancecostumesandjewelry.com/ankle-bells-and-ghungroo/.
Make sure the ghungru are strung on a rope and intended for Kathak dance. Depending on your height, purchase either:
1) Set of 25 bells for each foot, total of 50 bells
2) Set of 50 bells for each foot, total of 100 bells
3) Set of 100 bells on each foot, total of 200 bells