Life After PC
You've almost completed "the toughest job you'll ever love." Now what?
A recently released app will allow you to skip USA airport custom lines for free. Definitely would be a time-saver on your flight back home. Available for Android and Apple (and only in certain airports).
Send Stuff Home
The Thai Post Office has an online calculator to figure out how much shipping will cost. Depending on the weight, there are many options. You can use any box, and the cheapest rate is "surface" which may take a few months