make a skill or a beefup for the livinGrimoire.

post a demo and a price in this forum: 25$ to 100$  to buy said skill or beefup
and a walkthrough for using and integrating them.
preferably via fiverr I guess.

a skill : a DISkill for example

a beefup : an upgrade for the mainactivity, like an artificial eye, robotics integration,
a better ear, SMSing, make phone calls, or other such beefups.

in the demo post title add a [for sale] tag