http://www.jaxtr.com/user/index.jsp
sort of like a google phone but from jaxtr, is not free but cheaper than .23 cents per international text. if it works out to about .10 per text. you can cancel anytime.
you can try those free texting websites online but personally I'm paranoid my phone number is in a database somewhere waiting to be sold for .03 lol..I don't use/recommend those, just an idea for you.