If you are ever in Washington DC, stop by the Smithsonian Natural History museum. They have quite a display of bolas. The two photos below were taken in the museum a few years ago. The first photo shows a South American Aborigine using a bola on horseback in the Pampas. The second photo shows some of the bolas that are on display under glass.
Bolas are fairly easy to find in antique stores or through dealers.
I have acquired 7 bolas in the past 10 years. Eskimo bolas tend to be pricey. The bola immediately below is a 19th Century Argentinian bola. The chord is made from the skin of a large cat and the stone pouches are made of rhea skin. The span is 82 inches and it weighs 16.7 ounces.