Shipito lets you shop at your favorite US-based stores and have your packages delivered to you anywhere worldwide. This is useful for customers who need to get around region-specific stores. After signing up, Shipito gives you a permanent US mailing address that you can send your packages to.
When your packages are delivered to Shipito, they will take pictures of your packages and ship them out to you wherever you are in the world. They charge $2 + the cost of shipping. Check out their shipping cost calculator.
For power users, Shipito offers a paid plan that gives you a couple extra options including the ability to combine packages.