Well what would you consider “decent”
I already stated Vibrant has 3’’ J Bends from $60 which is 2-90’s, 1-45’ and a straight piece once you chop it up. They sell 3’’ Resonators from $60. So materials could be a minimum of $120 + some straight tubing bought from metal supermarkets.
And personally, coming from someone who has a mandrel bender. I will go buy a 3’’ J bend from Vibrant for $60 before I wasted 1 minute of time setting up the bender unless I had hundred of bends to do.