A:
If depends which TV you buy. Insingia is best buy's brand that uses parts from LG and Samsung that didn't meet specs for the other companies. Depending on which model Insignia you have your eye on, the manufacturer could be up 7 different companies. Xoceco Co. distributes them to Best Buy (they're an importer, but not a middle man because they're regulated by Best Buy Inc.)
A majority of the parts are from LG (and they also produce all the ATSC tuners for every HDTV built-in TV on the market and a plethora of other TV's), Philips-- which also has ties with LG-- and Toshiba has a share in creating the TV's as well.
It's a still great TV to buy, since it's best buy's brand. With the in house warranty you buy you can't go wrong. If it goes out If they can't fix it they will replace it with a new one. I bad $399 for my 48" and $249 for my 42". Great picture and so far so good. Knock wood...