2006 Mazda 6 Flex Pipe

I recently noticed that my car was getting a little loud. I brought it in to have it looked at and they told me that it my flex pipe had a hole in it and would need to be replaced. The part is currently on back order and will take a few weeks to get here. But they said with parts and labor it should cost about $850 to fix. I was wondering if this is a ridiculous amount to pay for that? If it is could anyone recommend a place that may be cheaper?