Just went thru this, researching all the ads, with the big retailer ads showing which ones will be on sale on black friday.
From what I could see, there are only a limited number with hugh discounts and you have to get them thursday evening or fri. If you find the model you want on sale and IF you are willing to fight the crowds, you could make a significant savings. Otherwise, there are a number of models on sale now with fairly good prices.
I bought a 50" Lg (LN5100) at Walmart for $448 plus tax. Extra 3 yr warranty was $44 if you want it. Its a basic model, 2 HDMI ports, simulated 120hz (most low end tv's with "120" is really simulated)and convenient controller. I have Direct TV and the 50" screen produces a good sharp picture with good sound quality.
Originally I was shopping for a 42-46" which I thought was max for the space I have, but if you measure the actually width of
of the various models, some 46-47's were as wide as my 50" and it works fine for me.
Good luck, and good shopping.