Dell has the LG 47LM4700 47" 1080p 120Hz 3D LED Slim HDTV and Sound Bar System for $730 with free shipping. Normally around $900. Includes sound bar and four pairs of 3D glasses. Best Buy has it for the same price. The 42" model 42LM3700 (with soundbar) is $580 shipped.
Could be 580 (and no tax? - not sure, but Best Buy and Walmart will have tax)
If you use American Express and link it to twitter you can get a $150 credit on your Amex making this tv cost $580.
Just google
american express dell twitter $150
for details.
or go to
https://sync.americanexpress.com/twitter/offerterms/F123270004
Wal-mart has it way cheaper around $648.