There are several stores that sell Galileos. Many are online. Here are a few:

Where to buy Edison.

Where to buy the Galileo 2. 

Where to buy Galileo 1

Some stores have started, or may soon start selling Galileos as part of an kit. 

 

Some things you might want to buy, when you buy your Galileo:

Galileo 2 accessories: 

GALILEO 1 ONLY