How to buy gadgets in China and not get screwed

Gizmodo's Elaine Chow travels to China, faces off with the sales people at Shanghai PC Mall and comes away a very happy customer. From Gizmodo:

This time around I went for something I recognized: an 802.11b/g Netgear that would run about $40 in the US. The starting price this time around was 300 yuan (or about $45). I countered with 150 and was scoffed at. Employing my best “Well, if you really aren't going to sell it to me for that much, I guess I'll just be on my way” look, I got the clerk to sigh and give it to me for 200 yuan. $10 off the US price and no sales tax added on at the end of the deal. Not too shabby.

In the next hours, I haggled over everything from speakers to hard drives to extra RAM for my laptop (installed for free, with an extra discount thrown in if I left my old memory sticks with them). I came home that day, arms loaded with new stuff, satisfied with having saved a good 20 to 25% off of US street prices.