I think I paid 55 dollars for 90 minutes. My son pointed out that their computers don't have clocks on them, so you are less likely to be aware of how long you're on! Obviously if you use your own laptop you can type an email as a word document and copy and paste.
We had verizon reception but I don't know much about the international plans. Be careful of the fees if you go to Mexico, I've heard that they are very high.