Re: German B1 lessons through skype
Verbalplanet is a good website, many teachers have trial lessons for free.
I just wanted to say that I studied through Skype, and it took me less than 60 lessons and under 900 Eur to cover A2 and B1. My teacher is not German and does not speak English, so she might not be the best choice for you, but if you are using Facebook, go to any group that is learning German (be it in Germany, Switzerland or Austria) and you will get teachers recommended to you.
You can try the freelancer websites, and post a job. When you interview people, ask them to prepare a particular lesson. If you like the way they teach you, then you hire them and start paying.