2002 Isuzu Rodeo Question Spark Plug Coil Replacement

Check Engine Light was blinking for few days on my 2002 Isuzu Rodeo Sport (3.2L V6, Rear wheel drive, 70,000 miles) and I took it to the mechanic who said its spark plug coils were burnt off and they need a replacement. He was saying it had total 6 coils out of which 5 were burnt off and it costs around $150/a piece for the new one and a total of $1200 to replace it. I read most of the messages in here and never came across anyone talk about this problem and want to be sure if this is that expensive:( Please advice. As this is going to be much expensive for me. Thank you very much.
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