Sorry to resurrect old threads but I have some info regarding the Insignia Receivers.
They are made by Aivin Electronic, which sells them I mass quantities. The minimum order is 550 units. So Best Buy orders them, slaps a Insignia logo on it and sells it.
Some cool features just looking at the receivers, they have toroidal power supplies, Toshiba transistors, and 10,000 uF capacitors. Technically speaking, not bad for $100-$150 if it doesn't break.