I bought a TV last year, and a website I found helpful was www.slickdeals.net (another good one is fatwallet.com, though they often have duplicate deals). It has good deals on various items, and it seems like tv's area regular update. On the home page, just click on browse, and them HDTVs. There should be some good deals on there, which are updated relatively frequently.
It's a fun site to waste time on if you want to spend money. Beware though, you may end up buying things you don't need! I hope this helps!