Tengai Makyo OAV?

All of my friends will tell you I'm a TMS fanatic, but when I found out
they animated a Tengai Makyo OAV, I wigged out!  I figured this might be
the best place to ask about it.  Anyone know where I can find a place to
buy it from or whatever?  Or even just some commentary from anyone who
has seen it would be cool too.

Thanks!
John