I was looking for a Phone Card call to Thailand and I found this website Thaiprepaid.com.
It has so many Thai phone card I can choose from with good quality and cheap.
I like this website so I want to recommend everybody to give it a try
I’m so sure you will love it too.

http://www.thaiprepaid.com

There are many website, some of them are given below:
http://www.cthai.com
http://www.thaitel.com
http://www.thaitelephone.com
http://www.thaidial.net
and many many more
http://www.thaiprepaid.com also good and reliable.