Not sure if it's still sold.

It isn't. MetaCreations (or Metastream, or Viewpoint, or whatever the #@%& they call themselves now) no longer produces it. Most of their assets were sold off to other companies (Poser --> CL, Bryce and Painter --> Corel, etc.) when they switched focus to interactive 3D, but no one snatched up Dance Studio.

The only way to acquire Dance Studio now is through second-hand sources. As PunkyMonkey says, it occasionally turns up on eBay. redsapphire still has a couple left in his eBay store.