I don't see how they know it was sucked in through the gas tank unless the tank has water in it and they would have to do more than just replace the injectors. And they might be saying that for extra money???? At 35" it would seem more plausible that some water got sucked through the intake by some splashing, etc.
Anyway, I don't think injectors should be very much. I think you can buy aftermarket performance injectors for anywhere between $25-$50, not sure about stock from the dealer though.
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