they recommend a Wacom intuos pro medium or better for zBrush or any sculpting app.a mouse is all but worthless for sculpting. 
you can muddle threw with a intuos small.

Blender is free.has sculpting tools.
you can get  mudbox for $10.00 a month.
there's 3DCoat. 

V4 has such a ridicules high polycount sculpting tools are advisable for original morphs.
Roxie ,Genesis 1,2  ya don't need sculpting tools for original morphs.

 

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The Artist that will fight for decades to conquer their media.
Even if you never know their name ,your know their Art.
Dark Sphere Mage Vengeance