Shenzhen China is really remarkable, going from a sleepy backwater town of 30k people in 1980 to a massive city of 12M+ and the number one manufacturing center of the world today. Having all this in a central location makes it easy and inexpensive to buy parts and equipment and the government stays out of the way for the most part, which is both good and bad. On top of that both the Chinese and US government subsidize shipping so it costs them almost nothing to send smaller stuff over here. The question is how long this can be sustained. My guess is that it won't be long so take advantage of it while we can.