Our company is specialised to spellcheck websites.
In our process there is a phase, for which we require 8-10 native German workers. The work is flexible, easy to do from home, called "sampling mistakes". Good grammar knowledge is required.
Our idea is that you get in contact with assosiations, organizations, which can offer or advertise this work to it's members.
For people like:
-home with child
Your work would be to search for these kind of organizations, get in contact with them, explain the job, make them to try it. If they are interested, you pass the contact details to me, and from then I would take care in making a contract with them.