pipes

I have a 1993 mazda truck b2200.  The muffler was making a noise, and I took
it to my local muffler shop.  The muffler was under warranty, however they
replaced an extension pipe that cost $56.00 and a prebent pipe that cost
$35.00.  I just couldn`t believe that pipes could cost that much, and then
there was 1/2 hour labor on top of that. Has anyone had these pipes
replaced, and what did you pay? Thanks.
Patt.