What is a reasonable repair cost for a bent flywheel? on 2004 Buick LeSabre

Knocking sound from underneath vehicle; diagnosed as a bent flywheel.

Asked by for the 2004 Buick LeSabre
To remove the transmission and replace the flex plate is about 8.8 hours work, the flex plate is about $90 and add for transmission oil and other materials.
Thanks Pat! Much obliged.
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I like patricks answer but i didnt see year make and model am i missing something ?