This past December, Best Buy had clearanced out a 50" LG Smart 3D Plasma TV for $399.00. It was 720p and came with no glasses, but the tv was awesome. Great picture and awesome color. Nowhere near my Samsung 55ES8000, but still an awesome TV for $400.00.So yes, you can get great 3D tv's for less than $500.00 nowadays.
Thanks. I would definitely pay $399 for a 51" 3D LED. I'll keep searching.