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Pricing is one thing, whether or not you actually need all of that work is another. That's a lot of sensor work. Usually the only time all the O2 sensors fail together is when someone has introduced lead or silicone to the engine. If lead was introduced the catalytic convertors may also be in question.
Some shops just sell all O2 sensors when one goes bad, figuring they can say "Well, you don't want to take a chance that the others will go bad soon, etc.", just to rationalize their overselling.
BTW, O2 and EGR sensors won't keep the car from starting. I have absolutely no idea what a "electrical control sensor" is, maybe a misunderstood term? My recommendation would be to find someone that won't jerk you around.
Beav
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