Where can I get Sulphur Hexafluoride?

Before I continue, let me clarify:

Despite it's sinister sounding name, Sulphur Hexafluoride is non-toxic and (to my knowledge) perfectly legal.

It's a heavy gas, and I want to obtain it for it's unique properties.

Inhaling it has the opposite effect of breathing helium. It makes your voice sound much much deeper.

http://www.youtube.com/watch?v=gQFGwp8mlno

Not to mention, because it's so heavy, you can drop lightweight objects in a container of it, and the object will appear to float on thin air.

Now, it's potential seems limitless to one who adores good pranks oh-so-much like me (:>), but it has a rather hefty price tag. When I went around on some chemical websites to find it, it was over two-hundred American buckaroos.

So, I'm wondering if anyone knows where to find it, or how to make it without having to pay so much.

I believe it is either used or has been used between panes of window glass as an insulator. Warm up the baseball bat. ;)

http://answers.yahoo.com/question/in...2214535AA9gp9l will tell you how to make it, also at great expense and trouble. If you want to get your hands on some, you'd be better off mowing lawns.