back before the internet, it was hard to find those anywhere to buy. I had crappy set from the local magic shop. You could find em Dead shows or some head shops in the larger cities but they were expensive as hell. (50-70 bucks). I've made a few pairs of my own which were better than the magic shops. JollyLLama makes good beginner sets for about $35. Back in H school my buds and I would get baked and stand in a circle and do those or hacky sacs. They're pretty fun drunk too.
LOTS of practice to get as good as that guy. but it ain't that difficult to pick up the basic tricks. I plan on upgrading to fire sticks( The ends have wicks you soak in kerosene and ignite) I think I'm to the point were I could do em without charring myself. My current set is clear with LED lighting in the shaft, real trippy at night.