At first, I was skeptical about this video, because it was by Royal Magic and was only 10 dollars.
Good thing I ended up getting it, because it is one of the most complete videos/books on sponge
balls (not that there's a lot of info on sponge balls though). It teaches you a bunch of sleights
and some nice routines. This video is a steal at 10 dollars. Should be priced MUCH more.