It appears they have a $99 version that was on sale a week ago for $79.

Conclusions
This is a remarkable tool that with Audionamix’s clear commitment will only get better and better. If like me, you have recordings that you would like to preserve apart from their backing track, or you are a DJ or Remix artist, you are going to love it.

Price: $499.00 or you can subscribe to it monthly for $32.99

Pros: As far as I know, there is literally no competitive product that does what this does as well.

Cons: Fairly steep learning curve, although if you know a DAW like Logic Pro X or an app like Melodyne DNA well, you will learn more quickly.

Web: http://audionamix.com/technology/adx-trax-pro/