As I still can't access chipmixer in usual way: How are the price structures there?
Their mixing service is completely free but you might have to pay transaction fee when sweeping private keys you will get there. I have also used them few times and I got really good mixing experience with them. No other mixing services have zero fee for mixinig.
Privcoin is emerging right now as multicoin mixing service with low fees, you can also try them.
What are the benefits of chipmixer giving out free service? Maybe ads or premium users? But many thanks for your tipps, will definitivly try that service.