I found that many people from all over the world look for a teacher to learn English.
The average rate of the lesson is $10 per hour.
Some countries charge $80 per 40 minutes for a face to face lesson (it's a lot!).
Sometimes, students look for a professional lesson, sometimes they look for a conversational lesson.
Skype is free to all, you just need to have a headset microphone.
Skype site: http://www.skype.com/
Luckily, I found one student who wants conversational lessons once a week.
It's not that much money, but if you have free time, internet access, and a headset microphone, it might be worth a try.
But beware, some people look for a language friend or partner which costs zero to both of you to learn languages, and you exchange the lesson with your partner.