I have two girls, almost 6 and almost 8 who are already bilingual. I would like them to learn yet another language. You would just need to talk to them for about an hour 3 times per week. You don't have to be a language teacher. I taught my kids my language by just talking to them and then reinforcing it.
I spent a great amount of time placing ads on craigslist and got nowhere. I thought that another person in a foreign country would be more than willing to help. Rate is $5 per hour and you need to have Skype and a Paypal account so I could send you the money.
You need to be proficient in both English and Spanish and have a pleasant personality.
Hope to hear from someone.