Thanks for your reply. Other people here suggested trying people per hour and fiverr which I tried. so far the offers range from 300 – 400 Euro per Character (I offered 650 for a double pack). I got many positive responses and interest.
So far I did not order, because no one was willing to send a proof of concept with a character implemented into facerig (a sketch) to show his ability.
Maybe it is easier to split it down into creating, rigging, and implementation. But of course this would double the price.