Simple generator transfer switch


I have been finding online $100 6-breaker transfer switches for the inside (1 240v and 4 120v). The obvious drawback is that after the well pump, fridge and heating I am limited to choosing only two rooms to have lights and it costs a lot to have installed. My lighting is very low watts so I don't want to be stuck in two rooms during a long outage and I have been getting some prices around $350 to install the box.
I would think that there should be a very simple switch out there that interrupts the line outside before the breaker panel and transfers the entire house over to the generator input and it would be at a reasonable price and resonable cost to instal since it is just one split. I can't seem to find a device like this anywhere.
In the $100 6 breaker box your getting the box and 6 breakers. In the 100 amp switches that I have been able to fine there is only one 100 amp switch and the unit costs $400. Does what I am looking for exists? Why are these 100 amp switches I am finding cost so much for so little?
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http://www.interlockkit.com/ is about as simple as you can get and have all of your circuits available to generator power.
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John Grabowski wrote:

This is a very very cool product. I just built a house with a separate generator panel. I wish the electrician would have known about this product. Cheaper and better, as you can select which circuits you want powered up. And it is UL approved to boot!
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Simple, for sure.
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Christopher A. Young
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John Grabowski wrote:

Easy to install, reliable, safe. This is what I would use.
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