Solomon Jagwe states that there is a relatively cheap alternative when you can afford a Wacom tablet.
Super Excited! I am finally able to use Zbrush on my iPad Pro, and sculpt with my Apple Pencil ~ this is a great alternative to those who can’t afford the high end Wacom tablets. The responsiveness is awesome. I tested both on my PC and a MAC, and in both cases Zbrush worked just fine. On the MAC there was some slight lag. Overall the experience has been great.
Did you try doing that yourself? Tell us about your experience in the comments below.