What do you mean this HDTV is a "derivative?" Some of the holiday electronics with those low sale prices are derivatives, models that have a few less features than a standard model in that product line, said Dworsky.
The difference can be subtle. "The image contrast ratio might be 20,000 in a derivative model versus 30,000 in a standard model," he said. "Most consumers probably won't even notice the difference."
A report earlier this month in Consumer Reports called attention to HDTV models from Samsung and Sony advertised in Black Friday deals that appear to be "derivatives." The report said these one-off TVs "with unfamiliar model numbers" are usually cheaper than the standard model in their class.
Dworsky cautions that retailers usually don't advertise these models as derivatives. "There's no way the average consumer will know that the TV model they are buying is not the standard one unless they are savvy enough to compare their model numbers," he said.