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

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

2 answers 1 comment
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.
I like patricks answer but i didnt see year make and model am i missing something ?