Around the World

So I will be going to shanghai china in june for around 8 weeks. I have verizon but am really not willing to spend 1.99 a minute, does any one know a godo prepaid service i can use over there to get ahold of some of my friends over there?

I will be using calling cards to call back to the us and skype but was wondreing what good service is over there for me and 12 of my classmates that are going?

Thanks, in advance