I just found this over on AVS Forum. If you use the link on this site...
to click through to CircuitCity.com it will give you 10% any order over $199. Which means you can save $80 on a new S3.
I tried a mock checkout using a fake email and address and it actually did apply the 10% off, so the link does definitely work. The only catch is the verbage says 10% off your "first order", so it may not apply to returning customers. But if you can get it to work then it'll offset the sale tax and give you a small discount.